Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f876a290d152317…

MALICIOUS

PDF

45.3 KB Created: 2020-08-29 20:29:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9a909c18488575607b2ca26b84832451 SHA-1: c0b12cb21607ed37c5eb8af02fee581fc1552830 SHA-256: 0f876a290d152317ad2f745bded5c26f9a42bdb4ea85f2801f23e265774c8a35
154 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm or SEO poisoning attempt. One prominent link directs to a known malicious redirector infrastructure. While no scripts were explicitly extracted, the presence of embedded URLs and the ML classifier's high confidence indicate malicious intent, likely to redirect users to harmful content or phishing 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/wix?keyword=diferencia+entre+cefalohematoma+y+caput+succedaneum+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0462/6943/1959/files/bekhayali_music_ringtone_pagalworld.pdf
    • https://cdn.shopify.com/s/files/1/0429/9256/6435/files/wumixisi.pdf
    • https://cdn.shopify.com/s/files/1/0438/1668/1629/files/just_a_few_more_things_wow.pdf
    • https://cdn.shopify.com/s/files/1/0438/3821/0205/files/59013704559.pdf
    • https://cdn.shopify.com/s/files/1/0429/8421/0583/files/gina_guidelines_for_asthma_2017.pdf
    • https://cdn.shopify.com/s/files/1/0429/1588/9305/files/ano_ang_unang_wika.pdf
    • https://cdn.shopify.com/s/files/1/0431/9579/3557/files/being_nocturnal_read_theory_answers_grade_8.pdf
    • https://cdn.shopify.com/s/files/1/0437/4321/5767/files/javascript_convert_latin1_to_utf8.pdf
    • https://static.usrfiles.com/ugd/b8c837_dfc587d6c35a4f17877ed0369fc95c21.pdf
    • https://static.usrfiles.com/ugd/b8c837_681f2cc7fc5c4ddc8bff164975e67588.pdf
    • https://static.usrfiles.com/ugd/b8c837_c158ba2cfbc04189b35daf60ae48f1cc.pdf
    • https://static.usrfiles.com/ugd/b8c837_6b6d999c51a34c7996ee9ac66540983d.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/57955619809.pdf
    • https://cdn.shopify.com/s/files/1/0433/4492/0734/files/ethical_leadership_starratt.pdf
    • https://cdn.shopify.com/s/files/1/0447/1540/9561/files/46594712100.pdf
    • https://cdn.shopify.com/s/files/1/0434/0131/4454/files/centrifugal_pump_operation.pdf
    • https://cdn.shopify.com/s/files/1/0430/0088/9507/files/cetoacidosis_diabetica_y_coma_hiperosmolar.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_off00006172.bin
4d055497a6feb0f44f7d563015dc603d3787e96b1a38d4a2774bd373cfffe422		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6172 5380 bytes
font_01_sfnt_off0000738e.bin
1a3d54eb75875c2bdbe1d21e8257d34e0390ef222589627de93304b369e7e552		 pdf-font-stream PDF embedded font (sfnt) at offset 0x738E 11000 bytes
font_02_sfnt_off0000976e.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x976E 4324 bytes

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