Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b0e60cf97454555…

MALICIOUS

PDF

49.7 KB Created: 2020-08-31 05:23:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e9e41b69149b5b10af10dcde782796d0 SHA-1: 392ae8a3808ddad236c6d1c63cf4b32df642e243 SHA-256: 5b0e60cf97454555104ced4d28b3c88264dbe1df979a7d0d2f949d926c0ee7f8
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with one pointing to a known malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, suggesting an attempt to manipulate search engine results or host malicious content. The ML classifier also strongly flagged this PDF as malicious.

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.com/wix?keyword=sd+formatter+v4.0
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/4725f1_1813b524d8b448328bf93bfe41b8ccac.pdf
    • https://static.usrfiles.com/ugd/b8c837_1199727eb6db4ef891fdadd5cfa11628.pdf
    • https://static.usrfiles.com/ugd/b8c837_44b688098da540dca333d2bb75b5df94.pdf
    • https://static.usrfiles.com/ugd/c3548c_ee235e315f014915b55ee3898eab4569.pdf
    • https://static.usrfiles.com/ugd/b8c837_337896b70c954961bb4fec53f7b53413.pdf
    • https://static.usrfiles.com/ugd/01e791_efc95654aa074af79dfa55f3aaabde19.pdf
    • https://cdn.shopify.com/s/files/1/0431/2386/7805/files/lagu_aaaa_sad_song.pdf
    • https://cdn.shopify.com/s/files/1/0431/3654/9018/files/dejuzabovupaworojisurenik.pdf
    • https://cdn.shopify.com/s/files/1/0434/4374/9029/files/z390_aorus_pro_wifi_manual.pdf
    • https://cdn.shopify.com/s/files/1/0435/9002/5375/files/un_biologi_sma.pdf
    • https://cdn.shopify.com/s/files/1/0435/2439/1071/files/pumpkin_ideas_for_halloween_templates.pdf
    • https://cdn.shopify.com/s/files/1/0433/7863/8998/files/application_form_for_employment_philippines.pdf
    • https://cdn.shopify.com/s/files/1/0434/7704/1304/files/73978197716.pdf
    • https://cdn.shopify.com/s/files/1/0454/0062/1224/files/punajefozojupidaribikokof.pdf
    • https://cdn.shopify.com/s/files/1/0431/1531/5349/files/luxasisubivesexe.pdf
    • https://cdn.shopify.com/s/files/1/0433/7670/5690/files/kukelasotujito.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_off00008309.bin
ec637f3d5198e56466fb36189ce463ad75f3f3b98eaa3abaf346c0031dfa5889
pdf-font-stream PDF embedded font (sfnt) at offset 0x8309 5268 bytes
font_01_sfnt_off000094e7.bin
9491b0ef851ed55484e38eabe1750705747e193ca9cf2f06078de5605baecd0f
pdf-font-stream PDF embedded font (sfnt) at offset 0x94E7 11252 bytes