Malicious PDF — malware analysis report

Static analysis result for SHA-256 08cf8cd3b515b432…

MALICIOUS

PDF

44.1 KB Created: 2020-09-09 09:19:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f4a8b64a73df2953f865083583629656 SHA-1: 638fb7c82033acbebab0d425bf6bc7d8b9e51eef SHA-256: 08cf8cd3b515b4327a4fa3cae163172995f777146e4a1d99dbec43545f0b36cc
154 Risk Score

Malware Insights

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

The PDF contains a link that redirects to malicious infrastructure, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though partially corrupted, contains text related to an 'online application form for public service commission', suggesting a phishing lure. The PDF_SEO_LINK_FARM heuristic indicates the presence of numerous external links, further supporting the malicious intent.

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.me/pify?keyword=online+application+form+for+public+service+commission
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0437/0094/5048/files/override_past_tense.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mowelikuzamutaj.pdf
    • https://cdn.shopify.com/s/files/1/0466/7070/8901/files/5225683705.pdf
    • https://cdn.shopify.com/s/files/1/0437/5730/6007/files/quimica_geral_e_reaC3A7C3B5es_quimicas_kotz.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/27360052690.pdf
    • https://cdn.shopify.com/s/files/1/0431/5247/4267/files/wasoriwip.pdf
    • https://cdn.shopify.com/s/files/1/0432/1126/0062/files/eclipse_free_for_windows_8._1.pdf
    • https://cdn.shopify.com/s/files/1/0431/1423/4017/files/49219491162.pdf
    • https://cdn.shopify.com/s/files/1/0432/0090/5373/files/car_bass_music.pdf
    • https://static.usrfiles.com/ugd/9058e5_9aa0fa24fdd14b7e97038753d6729080.pdf
    • https://static.usrfiles.com/ugd/eaf48f_9c96dfc17063420da7d9b1af9ca8f7be.pdf
    • https://static.usrfiles.com/ugd/359e64_5c3838b3583345179995cb160aad895c.pdf
    • https://static.usrfiles.com/ugd/97368a_875598dd8fce40cf9b50b6d239b7b598.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_off00005f12.bin
26a8ee8f8a2ba601fa52f3f013697c24cd50aa8395fc676d939a679c9f53ca9b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F12 5268 bytes
font_01_sfnt_off000070e4.bin
40d2d60c37d4ba67bdea9214a7c6963846b883ad7b02cb987cba4b978060609a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70E4 10716 bytes
font_02_sfnt_off00009574.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9574 4324 bytes

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