Malicious PDF — malware analysis report

Static analysis result for SHA-256 3aa11506dccd3b49…

MALICIOUS

PDF

52.5 KB Created: 2020-08-15 01:17:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-07
MD5: 03fab5e2bf82895a7b78567dc0c95eb0 SHA-1: 349a534eebb83722e17a521566647724d50b1ab1 SHA-256: 3aa11506dccd3b49c0fa81597758b5742f168ee5a5875c9edf78c96ae9ffaa41
202 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'ttraff.ru'. The document body, though heavily obfuscated, contains the same URL and appears to be a lure for 'synonyms and antonyms practice pdf'. The PDF also contains a large number of external links, many hosted on Shopify, which is flagged as a link farm. The primary malicious IOC is the redirector URL, which likely leads to further malicious content or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.ru/pify?keyword=synonyms+and+antonyms+practice+pdf In PDF document text
    • http://files.apdisasterresilience.org/uploads/1/3/0/7/130775002/fulobufakaziw_bulexisuwi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/4386/4228/files/22717139703.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/1490/6275/files/xixekunufofarapaw.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/5594/6645/files/bekirilimaduvezizi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0447/8582/7991/files/list_of_hand_embroidery_stitches.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6169/8969/files/20864166174.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7047/9772/files/manual_catia_v5_espaol.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/3033/0019/files/ib_french_ab_initio_textbook.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/6678/3904/files/blending_cvc_words.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/6322/9078/files/sufixuripigexuzanizileje.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

Related samples 1

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009054.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9054 5472 bytes
SHA-256: c138a396fffcbaa1efa57b01b07b01bb8a1df05c08ecf88289f436179d4cf540
font_01_sfnt_off0000a2db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA2DB 10280 bytes
SHA-256: 3271a7fc2136262940c0c6e3ce046cc1db8ea027758e1a1ce054b9ab51e30c74

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