Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c93f66b7ec88e55…

MALICIOUS

PDF

40.7 KB Created: 2020-08-10 00:44:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 24e10cd5596021a19907b5712b3c3f71 SHA-1: a25a8d407948ce22904ebdafbff40a14d5d46d70 SHA-256: 0c93f66b7ec88e5548fb8007948e5b6a2c4b2aa4534a231c0a0972bded018cff
202 Risk Score

Malware Insights

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

This PDF contains a large number of links, many of which point to a link farm designed to manipulate search engine results. One critical finding is a link to a known malicious redirector, ttraff.ru, which likely serves as a gateway to further malicious content. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the PDF structure itself facilitates malicious redirection and link farming.

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.ru/pify?keyword=calendario+mundial+2020+pdf+portugal
    • http://fuxesogof.artrageousperformingartscenter.com/uploads/1/3/0/8/130874359/somowafemujidaf-bilijot-zeribiziwuxepot-kagugajukudebaj.pdf
    • http://files.littlelyricist.com/uploads/1/3/1/8/131871644/0f7b24.pdf
    • http://files.caseyjohnsondesigns.com/uploads/1/3/0/7/130739864/6994137.pdf
    • http://mejopox.cbcmtg.org/uploads/1/3/2/6/132682883/5242569.pdf
    • http://nivijevi.a1nerdyhomes.com/uploads/1/3/1/4/131407148/gogefulirov-butinoxagiwiwag-dujerosozademo-pepuru.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0445/6975/5812/files/online_urdu_poetry_books.pdf
    • https://cdn.shopify.com/s/files/1/0431/5840/5274/files/attributes_of_god_aw_pink.pdf
    • https://cdn.shopify.com/s/files/1/0428/4098/1660/files/rinima.pdf
    • https://cdn.shopify.com/s/files/1/0437/4790/1592/files/bromelin_propolis_spray_bula.pdf
    • https://cdn.shopify.com/s/files/1/0436/7400/9753/files/regaderure.pdf
    • https://cdn.shopify.com/s/files/1/0430/5112/2842/files/nugezuvanijesewodasiwitun.pdf
    • https://cdn.shopify.com/s/files/1/0431/8104/7965/files/minezavinal.pdf
    • https://cdn.shopify.com/s/files/1/0433/9322/0758/files/titudabizovutomol.pdf
    • https://cdn.shopify.com/s/files/1/0431/3799/0805/files/duxuxoniwivojiwori.pdf
    • https://cdn.shopify.com/s/files/1/0447/1003/5609/files/bachon_ki_kahaniyan_download.pdf
    • https://cdn.shopify.com/s/files/1/0437/8938/5885/files/categorias_del_materialismo_dialectico_rosental.pdf
    • https://cdn.shopify.com/s/files/1/0428/9318/1081/files/dizerunumifukiwaredur.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_off00006229.bin
1224fb59a44101cbd9c6bb0930ec853ca7eb2632782f59432d64ad60a871f540		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6229 5360 bytes
font_01_sfnt_off0000744d.bin
a28a9c0cf6712ed972b6e9c622e9ba5d20ceb17e9cc090e4293e50e5f4202147		 pdf-font-stream PDF embedded font (sfnt) at offset 0x744D 9892 bytes

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