Malicious PDF — malware analysis report

Static analysis result for SHA-256 a881c979977f970b…

MALICIOUS

PDF

40.0 KB Created: 2020-08-23 00:50:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3a0dd45a0291d7d048831294c1333c38 SHA-1: d2a0d58e6a5b6021bf0501290c3f93aa495cb1c4 SHA-256: a881c979977f970bf2365dd718527be3ef3a5c4235d419a2cfe4154bc5554756
152 Risk Score

Malware Insights

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

The PDF contains a prominent link that, when clicked, redirects to a malicious URL identified as a redirector. The document body text and embedded URLs suggest a lure for a "utorrent app install", which is a common social engineering tactic. The ML classifier strongly indicated maliciousness, and the PDF structure itself contains numerous links, likely for SEO manipulation or to obscure the malicious destination.

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=utorrent+app++install
    • http://files.rocykafotografie.nl/uploads/1/3/1/4/131406780/3e9f7.pdf
    • http://files.rockinghamsixties.com/uploads/1/3/0/7/130738894/dufodonafodudodegek.pdf
    • http://petivimit.childemotionregulationlab.org/uploads/1/3/0/7/130775565/gasepavurilum.pdf
    • http://muxotawo.j-acevedo.com/uploads/1/3/0/8/130814070/nunam_misuledulozona.pdf
    • http://totase.libertyhighschoolorchestra.com/uploads/1/3/2/6/132680813/ddd8973b6f8e0.pdf
    • https://cdn.shopify.com/s/files/1/0432/3062/5947/files/naval_architecture_calculations.pdf
    • https://cdn.shopify.com/s/files/1/0437/2529/1674/files/biblia_de_estudio_thompson_en.pdf
    • https://cdn.shopify.com/s/files/1/0428/5690/6918/files/gixigikupa.pdf
    • https://cdn.shopify.com/s/files/1/0429/8876/5337/files/beden_dili_hareketleri_ve_anlamlar.pdf
    • https://cdn.shopify.com/s/files/1/0429/6101/0842/files/33986021850.pdf
    • https://cdn.shopify.com/s/files/1/0431/1855/9389/files/lewixim.pdf
    • https://cdn.shopify.com/s/files/1/0433/8266/9464/files/pififibafomaxagelag.pdf
    • https://cdn.shopify.com/s/files/1/0430/6042/8962/files/winikukazotadufetitikud.pdf
    • https://cdn.shopify.com/s/files/1/0433/7297/0135/files/43988982430.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_off000060a0.bin
8f18ef8c5d16f3e17e2c628455f18b242f2d9ac7d16d984f374189aa14020720
pdf-font-stream PDF embedded font (sfnt) at offset 0x60A0 4804 bytes
font_01_sfnt_off000070fc.bin
62aaf77fde018f2ee4edd6dab4975cca378cd80550b0c6460cc8ff6a577fe1fd
pdf-font-stream PDF embedded font (sfnt) at offset 0x70FC 10128 bytes