Malicious PDF — malware analysis report

Static analysis result for SHA-256 88652714b3129e10…

MALICIOUS

PDF

41.8 KB Created: 2020-08-27 18:58:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a37246f15fda63a46b1a1e7856638ab5 SHA-1: f60eb7a5cf4c618bea9eab7f687e7ac1b41de918 SHA-256: 88652714b3129e10b6582a6ab7251e23f5b8c7b96fe576b6e9a0e34a66f666ce
202 Risk Score

Malware Insights

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

The PDF contains numerous links to external resources, including a known malicious redirector at 'ttraff.me'. The document body also contains a call-to-action phrase, suggesting a lure to download further content. The presence of multiple PDF links, some pointing to potentially malicious domains, indicates an attempt to distribute malware or conduct phishing.

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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.me/pify?keyword=envision+math+common+core+reteaching
    • http://files.atkinsonbrassco.com/uploads/1/3/1/4/131437976/3196020.pdf
    • http://tinanop.aawcphilly.org/uploads/1/3/1/3/131398252/kirado-bitogik.pdf
    • http://lomos.shepherdsafricanadventure.com/uploads/1/3/1/6/131637814/fevekibufujib.pdf
    • http://xirim.w-here2stay.org/uploads/1/3/2/6/132682347/4794229.pdf
    • http://files.moldandwaterdamagespecialistinc.com/uploads/1/3/1/1/131164236/aaedee1cba232ab.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/5276/9192/files/34594240391.pdf
    • https://cdn.shopify.com/s/files/1/0431/8766/7104/files/vazupekexesunif.pdf
    • https://cdn.shopify.com/s/files/1/0434/1124/3162/files/11483392017.pdf
    • https://cdn.shopify.com/s/files/1/0427/6797/4556/files/57133649534.pdf
    • https://cdn.shopify.com/s/files/1/0436/5592/1822/files/libro_el_aprendiz_de_brujo_2_pnl.pdf
    • https://cdn.shopify.com/s/files/1/0430/4273/4237/files/83996021756.pdf
    • https://cdn.shopify.com/s/files/1/0438/3558/8770/files/53416898229.pdf
    • https://cdn.shopify.com/s/files/1/0430/6593/3973/files/82726911737.pdf
    • https://cdn.shopify.com/s/files/1/0432/2269/6098/files/blue_blue_eyes_song.pdf
    • https://cdn.shopify.com/s/files/1/0435/5437/3793/files/63758665117.pdf
    • https://cdn.shopify.com/s/files/1/0435/8235/7663/files/79638179614.pdf
    • https://cdn.shopify.com/s/files/1/0433/5999/4014/files/gozadawofopova.pdf
    • https://cdn.shopify.com/s/files/1/0433/1087/4777/files/50964868008.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_off000064d6.bin
7768ee97cd296da57874e61fcf96570dd86ff4a24bda444d5bc9d981f1a22913		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64D6 5200 bytes
font_01_sfnt_off0000765e.bin
7d7b0289897c6d50d410aed625db0a2c767796bdf9888077a3b7f480abb11bf6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x765E 10496 bytes

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