Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee5a3205bdb7e1c8…

MALICIOUS

PDF

32.1 KB Created: 2020-08-28 08:57:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e86b4842544b9a0f949ed024167a7da5 SHA-1: 1d1874dc2bee2d1bc8bf4bf2bf10b90c5ecc1c32 SHA-256: ee5a3205bdb7e1c86afd03437a215cfd2c732bf47fcc02587c050ab07a642f21
154 Risk Score

Malware Insights

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

The PDF contains a link to a redirector service, which in turn points to a URL containing 'amtemu virus reddit'. This suggests a phishing or malware distribution attempt. The PDF also hosts a large number of external links, many pointing to Shopify, which is characteristic of SEO link farm abuse for distributing malicious content. The ML classifier strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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.cc/pify?keyword=amtemu+virus+reddit
    • http://files.bellinfischer.de/uploads/1/3/0/8/130814329/8adc0e.pdf
    • http://files.superiortennisfl.com/uploads/1/3/2/6/132681969/3551921.pdf
    • https://cdn.shopify.com/s/files/1/0433/5733/9800/files/1639230457.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/1261535930.pdf
    • https://cdn.shopify.com/s/files/1/0432/7188/0870/files/siwibibodujizijapurum.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/21154843933.pdf
    • https://cdn.shopify.com/s/files/1/0435/2940/4567/files/kobufilimujaxudorejedev.pdf
    • https://cdn.shopify.com/s/files/1/0437/4901/5706/files/gawof.pdf
    • https://cdn.shopify.com/s/files/1/0437/1687/0296/files/mewefa.pdf
    • https://cdn.shopify.com/s/files/1/0434/6377/0272/files/jujewetaruv.pdf
    • https://cdn.shopify.com/s/files/1/0430/7828/7513/files/betpawa_ghana_apk.pdf
    • https://cdn.shopify.com/s/files/1/0434/6334/4280/files/75840545134.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004341.bin
f8322bf101cb3f6d84b1e158ff587399857b74c8af2462b5e5de9e303bdc5d7b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4341 4776 bytes
font_01_sfnt_off00005366.bin
f5914ce22e5491d4c955a5c8a53dd28ba667f0c3d21fe6c9a45c523ad7220993		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5366 9508 bytes

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