Malicious PDF — malware analysis report

Static analysis result for SHA-256 7830f28654b08327…

MALICIOUS

PDF

39.6 KB Created: 2020-09-01 05:31:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7dbc21e9e607dec5d937ce6e6411c92c SHA-1: 79966d664877b05f542f0f4766317375f627822b SHA-256: 7830f28654b083273213f4c68c1fea572e0e4d6c52c1f4b1d539436491dc5cb6
154 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which points to a known malicious redirector. The document body, though partially garbled, includes text related to 'Facebook for android' and a URL, suggesting a lure to trick users into clicking malicious links. The presence of numerous external PDF links further indicates a link farm, likely for SEO manipulation or distributing further malicious content.

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=facebook++for+android+4.+2+2
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/3016/7202/files/gimitamaj.pdf
    • https://cdn.shopify.com/s/files/1/0433/8489/7692/files/44175556027.pdf
    • https://cdn.shopify.com/s/files/1/0463/1691/2800/files/43795111359.pdf
    • https://cdn.shopify.com/s/files/1/0438/2110/5309/files/jotopaselonunufebapafot.pdf
    • https://cdn.shopify.com/s/files/1/0440/7823/5798/files/35635804277.pdf
    • https://cdn.shopify.com/s/files/1/0454/7867/4584/files/acids_bases_and_salts_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0431/2711/1841/files/kudotobom.pdf
    • https://cdn.shopify.com/s/files/1/0429/5586/6263/files/bjt_differential_amplifier.pdf
    • https://cdn.shopify.com/s/files/1/0429/5039/4019/files/gubejeg.pdf
    • https://static.usrfiles.com/ugd/f84671_5293d994cab047b7805d6c4de70eb670.pdf
    • https://static.usrfiles.com/ugd/de60da_c1fd390f394741fc94066f2dd57fe81a.pdf
    • https://static.usrfiles.com/ugd/599026_05147920daf94840a213908b91037f64.pdf
    • https://static.usrfiles.com/ugd/599026_d3bb80f15e4c47e782edf0dc9fb3e161.pdf
    • https://static.usrfiles.com/ugd/b8c837_73ae6c9a8a35453d8829e13e6750831e.pdf
    • https://cdn.shopify.com/s/files/1/0440/4396/0485/files/present_perfect_already_just_yet_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0431/8344/0033/files/bhojpuri_song_2019_new_dj.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_off00005c3a.bin
566ebf80ad2186e39e4074df326f19e1c195e0c76f15fbc473e3578c4a5cfc94		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C3A 5216 bytes
font_01_sfnt_off00006e17.bin
05c22335ef019acbed42505fb0b117dd36dce237d45a25cc6504a6eba7e99ab5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E17 10644 bytes

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