Malicious PDF — malware analysis report

Static analysis result for SHA-256 656d7dc4a5cd986a…

MALICIOUS

PDF

45.5 KB Created: 2020-08-07 17:03:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: 2f9894901babd8f13108d18b245e765a SHA-1: 863d6da7bd75903f4f2e3e040319e38b19ea5f34 SHA-256: 656d7dc4a5cd986a5471d9a8877dc6baef48a4c7ffb5bf984bfb67485562d631
194 Risk Score

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.com/pify?keyword=1st+grade+adding+worksheets+pdf In PDF document text
    • http://files.ambcircleoffriends.com/uploads/1/3/2/3/132303001/2152254.pdfIn PDF document text
    • http://files.joewoodmanwildlife.com/uploads/1/3/2/6/132695701/5bdf07640bf952.pdfIn PDF document text
    • http://wigum.ashleyelich.com/uploads/1/3/1/0/131071157/voxukekos.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5523/4710/files/clipping_algorithms_in_computer_graphics.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7732/8278/files/keresulitume.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2648/9249/files/14184964745.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/7529/5640/files/dancing_script_roblox.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nubizasijimowedemo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/1791/8870/files/pectoralis_major_myocutaneous_flap.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4667/4330/files/e_rickshaw_battery_charger_circuit_diagram.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/6934/8763/files/the_canterbury_tales_translated_by_nevill_coghill.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/1511/6696/files/pibivimunesefal.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vuvitew.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/7925/1608/files/2096309541.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/4207/8877/files/40360557734.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/3236/3676/files/wevivom.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0357/5454/files/66198681626.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/6222/9157/files/causes_of_ethnic_conflict_in_ethiopia.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006685.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6685 5172 bytes
SHA-256: 5fa81c8ac271664e746db5a6197c86400111d67974c266e8dd23048e6f6cb715
font_01_sfnt_off00007825.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7825 10132 bytes
SHA-256: e99b3ae3fda04e6dfb9f64c04c67368d008ec9560b4664c56b03d7475980ddef
font_02_sfnt_off00009ade.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9ADE 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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