Malicious PDF — malware analysis report

Static analysis result for SHA-256 e27d1194d63fed0b…

MALICIOUS

PDF

41.0 KB Created: 2020-09-07 10:07:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 375d6dc899ff3d088284b860f64ac610 SHA-1: 6aa8288e8db7ed4d805124a7f52d2352afc7dc1c SHA-256: e27d1194d63fed0b1e20fc1e06fd2efe9a6e54dde7202ffb57471fb0e1f8fc0f
152 Risk Score

Malware Insights

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

The PDF contains a mass of external links, including a critical link to a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'Android admob banner tutorial' and the malicious URL, suggesting a lure to a potentially harmful site. The ML classifier also strongly indicated maliciousness.

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.link/wix?keyword=android+admob+banner+tutorial
    • https://static.usrfiles.com/ugd/74a852_7693456ba9874cbe9b3a808f14e941a1.pdf
    • https://static.usrfiles.com/ugd/2e4eb4_1681bd226ac2411f91ed91efe839ae0f.pdf
    • https://static.usrfiles.com/ugd/b8c837_d8991a978f024afbb5ba4dd873c02fef.pdf
    • https://cdn.shopify.com/s/files/1/0437/5304/6165/files/76287491365.pdf
    • https://cdn.shopify.com/s/files/1/0431/6561/4234/files/pejelidon.pdf
    • https://cdn.shopify.com/s/files/1/0432/0663/9779/files/cartoon_pumpkin_templates.pdf
    • https://cdn.shopify.com/s/files/1/0433/4659/1903/files/examples_of_assumptions_in_quantitative_research.pdf
    • https://cdn.shopify.com/s/files/1/0433/0012/6880/files/18414936352.pdf
    • https://cdn.shopify.com/s/files/1/0433/0664/7717/files/7265663215.pdf
    • https://cdn.shopify.com/s/files/1/0431/2278/6466/files/1995194680.pdf
    • https://cdn.shopify.com/s/files/1/0433/3427/1126/files/csma_cd_and_csma_ca.pdf
    • https://cdn.shopify.com/s/files/1/0433/8037/5704/files/52191862920.pdf
    • https://cdn.shopify.com/s/files/1/0449/9764/0360/files/62945141193.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_off0000620a.bin
ec4486ff33ef010650ee8caea028720bc2b82d107148260cd09ed5d0fd93908e
pdf-font-stream PDF embedded font (sfnt) at offset 0x620A 4924 bytes
font_01_sfnt_off000072ac.bin
bdc57378e9e4a26426df801dc561260c652512fe087c7896e50439ed90675291
pdf-font-stream PDF embedded font (sfnt) at offset 0x72AC 10772 bytes