Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5fda9db249cc429…

MALICIOUS

PDF

34.9 KB Created: 2020-08-02 12:39:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dd2d98f45fabfae05694017427286478 SHA-1: e07db0270ff09c395a4816fc948a6b76eb680838 SHA-256: a5fda9db249cc4297fdec3ecc24ba567867da48b44ec83f245aa78077b4f9c38
152 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with a critical heuristic firing for a malicious redirector link. The document body, though partially corrupted, contains text related to 'Psychology 6th edition hockenbury pdf' and includes the malicious URL. This suggests a phishing or scam attempt, likely leading users to a malicious site via the ttraff.cc redirector.

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=psychology+6th+edition+hockenbury+pdf
    • http://files.vcmc.org/uploads/1/3/0/7/130739443/vanofejiged-jinusiwifot-vinivam.pdf
    • http://files.apostolicdeliverancefive.org/uploads/1/3/0/9/130969761/e3f0c.pdf
    • http://files.anastazjakrokosphotography.com/uploads/1/3/1/8/131872105/3815522.pdf
    • https://cdn.shopify.com/s/files/1/0429/8348/9687/files/kolomilifudazig.pdf
    • https://cdn.shopify.com/s/files/1/0432/0965/4434/files/42108568993.pdf
    • https://cdn.shopify.com/s/files/1/0432/2073/0011/files/20501609098.pdf
    • https://cdn.shopify.com/s/files/1/0432/3141/2379/files/99353682938.pdf
    • https://cdn.shopify.com/s/files/1/0427/7701/8524/files/gilejasuputa.pdf
    • https://cdn.shopify.com/s/files/1/0428/1437/4054/files/67530807742.pdf
    • https://cdn.shopify.com/s/files/1/0433/3142/0314/files/88726122633.pdf
    • https://cdn.shopify.com/s/files/1/0435/8907/5102/files/tigavebuxixudogo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nubizasijimowedemo.pdf
    • https://cdn.shopify.com/s/files/1/0436/4576/3744/files/76155172293.pdf
    • https://cdn.shopify.com/s/files/1/0431/8052/3678/files/51959847127.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_off00004980.bin
d8e1d182060b69747e051a9a1b2154b48d7bb029b30bdcb6cda621345a72f323
pdf-font-stream PDF embedded font (sfnt) at offset 0x4980 5668 bytes
font_01_sfnt_off00005ccb.bin
af07dba450d4b837311b6bcf10f32250c6652812b157b7814aab5e24cf05c1f7
pdf-font-stream PDF embedded font (sfnt) at offset 0x5CCB 10112 bytes