Malicious PDF — malware analysis report

Static analysis result for SHA-256 2acc71e4804d7811…

MALICIOUS

PDF

48.4 KB Created: 2020-08-13 23:16:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c71126328ea81fe3573775edef2e194c SHA-1: aec45d84786c54ee0d772cf4511ef999e2ed9350 SHA-256: 2acc71e4804d781156ac428117c7480dc72ec452c7947eb38fed95c3a49087ef
152 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, identified as a link farm, with one URL specifically flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body contains garbled text but includes the malicious redirector URL, suggesting an attempt to lure users to 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=co_+_t+d__+c_+l_+hangman+answers
    • http://files.ndhumanities.org/uploads/1/3/1/3/131379149/9b622.pdf
    • http://viwixuno.mytexanlife.com/uploads/1/3/0/7/130738524/677a7.pdf
    • http://files.haralsoncountyhistory.com/uploads/1/3/2/3/132302913/4438840.pdf
    • https://cdn.shopify.com/s/files/1/0428/6991/5814/files/watulubexalereruxiso.pdf
    • https://cdn.shopify.com/s/files/1/0433/2004/9822/files/acetilcolina_funcion.pdf
    • https://cdn.shopify.com/s/files/1/0431/1020/3556/files/84771069636.pdf
    • https://cdn.shopify.com/s/files/1/0438/5921/4501/files/13164438463.pdf
    • https://cdn.shopify.com/s/files/1/0428/9832/5663/files/74298841393.pdf
    • https://cdn.shopify.com/s/files/1/0428/5153/2963/files/defubabewuvazafonitol.pdf
    • https://cdn.shopify.com/s/files/1/0429/6625/3724/files/algebra_word_problems_worksheet_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0431/2937/2821/files/jamujaruberumafunop.pdf
    • https://cdn.shopify.com/s/files/1/0430/0704/9877/files/poxolik.pdf
    • https://cdn.shopify.com/s/files/1/0434/8618/3576/files/zisuwudanaw.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/96704933611.pdf
    • https://cdn.shopify.com/s/files/1/0437/1460/9303/files/32682998298.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007f21.bin
8aea40b00910c5eb946f4c7daa5e3b7e1567de8b7e34f17b3183366a1774ed04
pdf-font-stream PDF embedded font (sfnt) at offset 0x7F21 5380 bytes
font_01_sfnt_off00009152.bin
290f33ebd7c7b167b7606042fe423797a7cfdb946850f4560bde00fb1ab3487b
pdf-font-stream PDF embedded font (sfnt) at offset 0x9152 10256 bytes