Malicious PDF — malware analysis report

Static analysis result for SHA-256 7898fb1c40b90823…

MALICIOUS

PDF

45.0 KB Created: 2020-08-23 17:20:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d4f7b0ced0d0e9db6148de5fdd530b05 SHA-1: 34ebd46f853f87ce13267639c8f7be372c60615c SHA-256: 7898fb1c40b90823e069d4f99cad95b9abb83a95f30df8d0b276952f6e9c7394
154 Risk Score

Malware Insights

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

The PDF contains embedded links, with one specifically pointing to a known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text related to 'Linkedin api profile information' and includes the malicious URL, suggesting a phishing or social engineering lure. The presence of numerous external PDF links further indicates a link farm, likely used to distribute malicious content or traffic.

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/pify?keyword=linkedin+api+profile+information
    • http://puvosu.puretransformation.net/uploads/1/3/1/3/131383363/nawuga-satuzu.pdf
    • http://tumov.gottahavethisllc.com/uploads/1/3/1/4/131482952/1585157.pdf
    • http://mefozaneb.litturi-photography.com/uploads/1/3/2/7/132710567/rijusiwub.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0438/3349/1606/files/free_indesign_booklet_templates.pdf
    • https://cdn.shopify.com/s/files/1/0451/0197/3657/files/bernt_oksendal_stochastic_differential_equations.pdf
    • https://cdn.shopify.com/s/files/1/0427/7652/7014/files/ranovirowujetox.pdf
    • https://cdn.shopify.com/s/files/1/0431/9569/5266/files/chopin_nocturnes_op_9_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0430/9975/0560/files/66038770765.pdf
    • https://cdn.shopify.com/s/files/1/0431/4464/2715/files/renatujom.pdf
    • https://cdn.shopify.com/s/files/1/0429/4865/7318/files/fajufibevetijegoxozi.pdf
    • https://cdn.shopify.com/s/files/1/0429/0006/2367/files/danganronpa_2_1st_trial_guide.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/kopamidije.pdf
    • https://cdn.shopify.com/s/files/1/0437/1854/1480/files/handbook_of_psychological_assessment_4th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0432/1152/2209/files/aircraft_spruce_com_neworderform_php.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_off000072f4.bin
e636806f6cb4daf6939f356c1bd33c88857318e0e851b2fafcc79e73c8d0c107
pdf-font-stream PDF embedded font (sfnt) at offset 0x72F4 5016 bytes
font_01_sfnt_off000083f5.bin
938a8640753043d4dd44de46499da2f87781a9073b8420a930383fc5d37edebc
pdf-font-stream PDF embedded font (sfnt) at offset 0x83F5 10232 bytes