Malicious PDF — malware analysis report

Static analysis result for SHA-256 195589d13ce105dd…

MALICIOUS

PDF

55.8 KB Created: 2020-08-14 01:49:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4c8ee7b3050adaed9ddab1a92183864e SHA-1: 161116f0a08e3e3ce3e530b211df2b9229eb67d0 SHA-256: 195589d13ce105dd24684854c298355d4999d2310cbb26259459e5d5095926b8
194 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to potentially malicious or redirector infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_LINK_FARM heuristics. The document body text, though partially obfuscated, includes the URL 'https://ttraff.ru/pify?keyword=administrative+procedures+act+pdf', suggesting a lure to a site that may host malicious content or phishing pages. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • 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=administrative+procedures+act+pdf
    • http://files.equestrianeliteatapplejackfarm.com/uploads/1/3/1/4/131453725/dcaa468ae5982f.pdf
    • http://gufebi.adventurersoutpost.com/uploads/1/3/1/8/131871674/jakulogebimebugi.pdf
    • http://files.mjearthworks.com/uploads/1/3/1/3/131380295/4176383.pdf
    • http://files.mendesdacosta.com/uploads/1/3/1/4/131454696/a4a268ab4a5.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0431/0351/8882/files/brassage_genetique_cours_terminale_s.pdf
    • https://cdn.shopify.com/s/files/1/0433/6749/7884/files/wasulevijamowetelewowite.pdf
    • https://cdn.shopify.com/s/files/1/0428/2161/5775/files/lanajoguxi.pdf
    • https://cdn.shopify.com/s/files/1/0430/9562/1781/files/17272750469.pdf
    • https://cdn.shopify.com/s/files/1/0429/6271/4773/files/16833112134.pdf
    • https://cdn.shopify.com/s/files/1/0449/4236/0744/files/9481654664.pdf
    • https://cdn.shopify.com/s/files/1/0432/8947/7278/files/vokunikexamol.pdf
    • https://cdn.shopify.com/s/files/1/0428/9075/6259/files/vafanopujijixaxo.pdf
    • https://cdn.shopify.com/s/files/1/0433/9728/3992/files/algebra_2_prentice_hall_answers.pdf
    • https://cdn.shopify.com/s/files/1/0432/9196/7652/files/variromurux.pdf
    • https://cdn.shopify.com/s/files/1/0429/8797/8913/files/87247356492.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008eb6.bin
8f9d997d334fcb1d10acc838d5bdc137db0d792e172771c153ba04fc611e3e0c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8EB6 5200 bytes
font_01_sfnt_off0000a04b.bin
dd3703bcc972774eb42f5778d2e0aa0fbf616e3180218df7f9d22d260f73f7ab		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA04B 10508 bytes
font_02_sfnt_off0000c438.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC438 4324 bytes

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