Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a8572f91c47ec96…

MALICIOUS

PDF

46.3 KB Created: 2020-08-23 02:27:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1c51f4577393fab78f0eb3f715e9e983 SHA-1: 36ddf188d62cecbfc93fc02eafc60a51794188d8 SHA-256: 0a8572f91c47ec96b886d2f089e6a90a02d826c0e96a50038c5c88f92203fb1b
154 Risk Score

Malware Insights

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

The PDF contains a link to a redirector, which is a common tactic for distributing malware or phishing pages. The document body, though heavily obfuscated, contains the same lure text and URLs found in the heuristics, suggesting an attempt to trick users into clicking the malicious link. The presence of numerous PDF links also indicates a link farm, likely for SEO poisoning or traffic generation to malicious sites.

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=assassin%2527+s+creed+2+pc++apunkagames
    • http://fakolep.saraschneeberg.com/uploads/1/3/1/4/131455734/ced432ee4101326.pdf
    • http://files.columbiawildcatbands.com/uploads/1/3/1/0/131069819/pekepevo.pdf
    • http://files.oswegoeastmensxctf.com/uploads/1/3/1/4/131406435/mevumu-kosopijojarosit-metilozitin-bapelu.pdf
    • http://files.runtoclimax.org/uploads/1/3/0/7/130740547/donewenexovu_gukabetatidil_tagigesi_rufuxezilu.pdf
    • http://pawuwez.cantonohiolandscaping.com/uploads/1/3/0/7/130776321/3998718.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0449/6248/0296/files/24789751621.pdf
    • https://cdn.shopify.com/s/files/1/0438/1389/6352/files/93912544637.pdf
    • https://cdn.shopify.com/s/files/1/0436/9747/1656/files/10882039261.pdf
    • https://cdn.shopify.com/s/files/1/0434/7258/4861/files/savelomuwosuvarilawobe.pdf
    • https://cdn.shopify.com/s/files/1/0431/5188/4445/files/rexigaxomirotefuro.pdf
    • https://cdn.shopify.com/s/files/1/0431/7410/1160/files/somewhere_only_we_know_lyrics_meaning.pdf
    • https://cdn.shopify.com/s/files/1/0431/2137/7434/files/41643859794.pdf
    • https://cdn.shopify.com/s/files/1/0430/9676/8673/files/duluselawe.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/28650507632.pdf
    • https://cdn.shopify.com/s/files/1/0427/6515/6508/files/setidibinu.pdf
    • https://cdn.shopify.com/s/files/1/0430/8484/1124/files/2293724218.pdf
    • https://cdn.shopify.com/s/files/1/0437/9767/6192/files/boingo_tv_app.pdf
    • https://cdn.shopify.com/s/files/1/0432/1070/3012/files/21171456611.pdf
    • https://cdn.shopify.com/s/files/1/0429/6785/9359/files/nikolai_ostrovsky_how_the_steel_was_tempered.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007660.bin
4f111f720c6d466c58de798b6962252105c4a38b3d037d5b49319c22812897c7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7660 5580 bytes
font_01_sfnt_off0000894f.bin
c565c78e316b164d463f289111b346d80b037477454ac2356089530f7f2d5da6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x894F 10192 bytes

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