Malicious PDF — malware analysis report

Static analysis result for SHA-256 6985742c99d4da7d…

MALICIOUS

PDF

65.1 KB Created: 2020-08-18 20:23:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5007f0e3ecf07a305b194802a4853aca SHA-1: 835d26864bd222b77fdb65bf9c8b5e0b42852d19 SHA-256: 6985742c99d4da7dfcd2cbe8f0178af9653ed4c74ac1b625ec3efa17ef4253a5
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one critical heuristic identifying a link to a known malicious redirector. The document body, though heavily obfuscated, contains a URL that appears to be the same as the one identified by the heuristic. The presence of a link farm suggests an attempt to generate traffic or distribute 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.ru/pify?keyword=visual+studio+2015+keyboard+shortcuts+cheat+sheet
    • http://files.kidsnchordsmusic.com/uploads/1/3/1/6/131607269/e4d9284f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0434/7848/3096/files/duzoli.pdf
    • https://cdn.shopify.com/s/files/1/0430/3283/8298/files/zurexagujufobefodatemube.pdf
    • https://cdn.shopify.com/s/files/1/0433/0127/3758/files/persuasive_writing_example.pdf
    • https://cdn.shopify.com/s/files/1/0429/7709/9939/files/21005561696.pdf
    • https://cdn.shopify.com/s/files/1/0432/8646/2620/files/fafiweviw.pdf
    • https://cdn.shopify.com/s/files/1/0433/4652/6376/files/12494699910.pdf
    • https://cdn.shopify.com/s/files/1/0431/4493/7623/files/60ktyz_synchronous_motor.pdf
    • https://cdn.shopify.com/s/files/1/0431/1092/4437/files/anonymously_report_osha_violations.pdf
    • https://cdn.shopify.com/s/files/1/0437/2781/4810/files/bajirao_mastani_tamil_movie_in_hd.pdf
    • https://cdn.shopify.com/s/files/1/0436/4327/3369/files/bank_secrecy_act_training.pdf
    • https://cdn.shopify.com/s/files/1/0432/8914/9608/files/tivutalaxofurumofame.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/76102764406.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_off0000a21b.bin
294150c64ad5b3548a91e790f76ce21424b56de5fef030573811cf0412ba9233
pdf-font-stream PDF embedded font (sfnt) at offset 0xA21B 5524 bytes
font_01_sfnt_off0000b4fd.bin
89653a013780bcf7a0def866dd5e874200ec57cc36830afbac0e1957eb7d08a3
pdf-font-stream PDF embedded font (sfnt) at offset 0xB4FD 15828 bytes
font_02_sfnt_off0000e650.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176
pdf-font-stream PDF embedded font (sfnt) at offset 0xE650 4324 bytes