Malicious PDF — malware analysis report

Static analysis result for SHA-256 99cec5823fcb8e14…

MALICIOUS

PDF

46.0 KB Created: 2020-11-02 03:29:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: d9515035f4c59ccfac161d749984aa47 SHA-1: dd2f16fde2c12623f57fab96d02aeb7060e46897 SHA-256: 99cec5823fcb8e1431584852dfbd91aa3643f3c3a9234d305f7f45473482a344
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document contains numerous links to redirector infrastructure, specifically identified as a malicious redirector at 'https://ttraff.me/pify?keyword=ssr+pit+bike+maintenance'. The document body, though heavily obfuscated, contains text related to 'Ssr pit bike maintenance', suggesting a lure to disguise the malicious intent. The presence of a large number of external PDF links further indicates a link farm or SEO poisoning tactic to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.me/pify?keyword=ssr+pit+bike+maintenance In PDF document text
    • https://xironudobavus.weebly.com/uploads/1/3/4/4/134461104/porujemeki_wiwevuzazav_siwomafap_zebewuk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383132/normal_5f98df1940c67.pdfIn PDF document text
    • https://bitekiparoduj.weebly.com/uploads/1/3/4/0/134017536/7089296.pdfIn PDF document text
    • https://wefamojugibe.weebly.com/uploads/1/3/1/1/131164519/kaven_lidotobin_robisud_tepefobinijowaf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385009/normal_5f96dc7b2e151.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/cfe6a199-436f-43b9-b4cb-ac4787bb9e76/30903579138.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab9774e3-0866-422b-bda7-e63e8342a89a/rizipurabozufijinaf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37f0b085-f30a-4c8c-b221-16ed77aaa3df/14072364283.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/edd75a56-a7cc-40f5-a237-5d09d444e8c7/64721800910.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33760a48-6d9d-43c2-83cf-91f0a02647c0/tasco_red_dot_bkrd30_22.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0495/7841/0136/files/prelude_to_the_afternoon_of_a_faun_genre.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c61f0226-e1b2-4a05-a971-ad6bc4a2b785/wiwuditefisunitijemuzok.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef3d5e2c-ba68-4363-92ea-23b0f37788ca/29526578907.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f27b43ab-e016-4c68-a051-e92a18a5ae66/nilizogakaped.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/2296/9764/files/why_is_the_number__special.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4309e1f3-9856-4cee-a022-45c9bb10549e/9683466442.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5683a5b5-444b-4aa3-b4fc-d09ebfc2f97a/bodok.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000753b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x753B 5356 bytes
SHA-256: a0c5bd90ac7cd8c55cc3bb1a48a3ece3827d3a10b84d154d08f13eff085c6407
font_01_sfnt_off00008754.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8754 10452 bytes
SHA-256: 0b0767b5a32a54f965382c4f06cf69ab96b79b97a0384c53cb4e8ebb6b7bd85e