Malicious PDF — malware analysis report

Static analysis result for SHA-256 71bed28fe9dace3c…

MALICIOUS

PDF

39.4 KB Created: 2020-08-18 12:54:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6a122a36cd32b1f14c63c2c45fb3c231 SHA-1: 74acfec198a6905d68af3e04ebbb1be7bd598350 SHA-256: 71bed28fe9dace3c4bcf7c011fe405b3275402c6156c0e65b46848fff870621d
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing indicating it leads to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text related to 'Artisteer templates free' and URLs, suggesting a lure to a malicious site. The presence of embedded URLs and the nature of the heuristics strongly indicate a phishing or redirection attack, likely delivered as an attachment.

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.com/pify?keyword=artisteer+templates+free
    • http://vaduf.quietgovernmentmen.com/uploads/1/3/0/7/130739063/zuvobute.pdf
    • http://files.selplasticpallet.com/uploads/1/3/2/3/132303229/bitizugele.pdf
    • http://files.mrsmuenks.com/uploads/1/3/1/4/131436967/d1c70d3a5d4d991.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/3794/0122/files/kopadokisabexonalufagate.pdf
    • https://cdn.shopify.com/s/files/1/0433/7251/1386/files/kisagomelisebalofuzov.pdf
    • https://cdn.shopify.com/s/files/1/0433/7496/8986/files/humphreys_introduction_to_lie_algebras_and_representation_theory.pdf
    • https://cdn.shopify.com/s/files/1/0432/1509/3920/files/77776593869.pdf
    • https://cdn.shopify.com/s/files/1/0438/9437/4555/files/vaminakitokekev.pdf
    • https://cdn.shopify.com/s/files/1/0435/7410/0127/files/3692301532.pdf
    • https://cdn.shopify.com/s/files/1/0435/4772/1882/files/falibeso.pdf
    • https://cdn.shopify.com/s/files/1/0429/2929/1427/files/geological_map_of_africa.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005d5d.bin
de067382a95fa95e4096a4a0bdcaf9133531917bad6e1955c050fd38c9906d07
pdf-font-stream PDF embedded font (sfnt) at offset 0x5D5D 5036 bytes
font_01_sfnt_off00006e60.bin
1f21a748c8c793e7d865139c96f2656cebd8f03c9c833aab2dfc33da679e20b5
pdf-font-stream PDF embedded font (sfnt) at offset 0x6E60 10216 bytes