Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac378f2648bbed4a…

MALICIOUS

PDF

45.3 KB Created: 2020-08-22 01:44:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ce6b4fa8528fd85030057d23f6f276ea SHA-1: 05ec17d3fcf6a61af0239ed2569716ae42ac8eab SHA-256: ac378f2648bbed4aeca001a4029354521aa6c67f47465e1db50f16dd43c2ec30
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link T1059.001 PowerShell

The PDF contains a large number of embedded links, with one identified as a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body text is heavily obfuscated and appears to contain the malicious URLs, suggesting the primary purpose is to lure users to malicious sites, potentially for phishing or malware distribution.

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=picada+de+formiga+inchaco
    • http://siweb.carolmeadsart.com/uploads/1/3/1/4/131453960/40bac6d1884291b.pdf
    • http://webed.moodyplumbinginc.com/uploads/1/3/1/4/131438044/3458667.pdf
    • https://cdn.shopify.com/s/files/1/0432/8433/2710/files/how_to_dual_box_wow.pdf
    • https://cdn.shopify.com/s/files/1/0431/2258/9853/files/jipizow.pdf
    • https://cdn.shopify.com/s/files/1/0432/5713/5257/files/64241618534.pdf
    • https://cdn.shopify.com/s/files/1/0430/3332/9815/files/totemusaxixagemoxaw.pdf
    • https://cdn.shopify.com/s/files/1/0447/0325/2636/files/smash_mouth_all_star_mp4.pdf
    • https://cdn.shopify.com/s/files/1/0438/8257/8088/files/german_language_learning_books.pdf
    • https://cdn.shopify.com/s/files/1/0433/5930/5877/files/42752798216.pdf
    • https://cdn.shopify.com/s/files/1/0428/0716/5095/files/sumizedudexodikej.pdf
    • https://cdn.shopify.com/s/files/1/0428/5667/7543/files/senior_accountant_interview_questions_and_answers.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/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005f66.bin
a93b9f7a8fe137388358e17cc2b06f52ce4908fc4b0cfcff39aa0f71fdf9919d
pdf-font-stream PDF embedded font (sfnt) at offset 0x5F66 5228 bytes
font_01_sfnt_off000070f6.bin
f8689f3e8faf7733c7b1a2f9a1db7a2819b1a39ccfd08eea9359bc099600dc71
pdf-font-stream PDF embedded font (sfnt) at offset 0x70F6 10008 bytes
font_02_sfnt_off00009349.bin
c988415812f594187b0a0ed75dc52802e798e1695b49bd300f8412a65040a449
pdf-font-stream PDF embedded font (sfnt) at offset 0x9349 16204 bytes