Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f9ec7fdd5377337…

MALICIOUS

PDF

65.3 KB Created: 2020-08-03 13:30:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2473a164b4cf163eb656b6d9b0447847 SHA-1: 037b5ac1e3754ac545b3f60d57ac6f38f221e747 SHA-256: 6f9ec7fdd53773379866f713f0911fccd473ce0d19758b3a4184183ea5b4a317
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains multiple heuristics indicating malicious intent, including links to known malicious redirectors and a large number of external PDF links, suggesting a link farm for SEO poisoning. The document body, though heavily obfuscated, contains a URL that appears to be part of the malicious redirector infrastructure. The ML classifier strongly flags this PDF as malicious, supporting the conclusion that it is designed to redirect users to malicious content.

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.cc/pify?keyword=biblia+de+estudio+inductivo+reina+valera+1960+pdf
    • http://nimufipo.breathefreeme.org/uploads/1/3/1/4/131453541/5246586.pdf
    • http://files.rhadpc.com/uploads/1/3/1/8/131871586/foxaxifasavuxu.pdf
    • http://mefekibeb.utcifc.com/uploads/1/3/0/8/130873822/9468451.pdf
    • http://netefiv.hopeofglorychristinmebriankinnett.com/uploads/1/3/1/3/131380126/8502417.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0427/6974/4028/files/bonifisonewotatapusejona.pdf
    • https://cdn.shopify.com/s/files/1/0431/8121/1810/files/dazonegavijemif.pdf
    • https://cdn.shopify.com/s/files/1/0431/8353/8331/files/34704840307.pdf
    • https://cdn.shopify.com/s/files/1/0435/4434/6792/files/44617800261.pdf
    • https://cdn.shopify.com/s/files/1/0431/5512/8477/files/bezuzi.pdf
    • https://cdn.shopify.com/s/files/1/0430/8028/6372/files/35834534489.pdf
    • https://cdn.shopify.com/s/files/1/0430/3293/6605/files/xulurusarixeduxaxisuxe.pdf
    • https://cdn.shopify.com/s/files/1/0437/2961/7057/files/wirudekowamadewibesorefut.pdf
    • https://cdn.shopify.com/s/files/1/0431/1125/2132/files/zewigalemo.pdf
    • https://cdn.shopify.com/s/files/1/0431/6404/1373/files/ashcroft_mermin_solid_state_physics_solutions.pdf
    • https://cdn.shopify.com/s/files/1/0433/4462/5822/files/17074696650.pdf
    • https://cdn.shopify.com/s/files/1/0429/8034/3961/files/meroruzadesijalijewodavur.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_off0000bc6c.bin
1df6b85b033ad4b02f49877ba17db480c10ea0fba360a6c825c908cf916e9167		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBC6C 5904 bytes
font_01_sfnt_off0000d091.bin
8d693c7f4d7baa3a653a7a019023ea2fd5fdba876ee9863b6d00ab546b28f3e5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD091 11500 bytes

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