Malicious PDF — malware analysis report

Static analysis result for SHA-256 a275b5b52dff0090…

MALICIOUS

PDF

73.7 KB Created: 2020-08-23 16:06:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1327813a0f91b6f9f37566f24471f9a5 SHA-1: e002ed265125466b52de598b8af3c72c63af7890 SHA-256: a275b5b52dff00905dd2bfef80c2735ade77513c06a2109c25557e088a0ac951
152 Risk Score

Malware Insights

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

The PDF was flagged as malicious by an ML classifier and contains numerous embedded links. A critical heuristic identified it as a PDF link farm, with many links pointing to Shopify domains. One of the embedded URLs, 'https://ttraff.cc/pify?keyword=friends+songs++masstamilan', is also flagged as a known malicious redirector. The document body contains garbled text but includes the redirector URL, suggesting a lure or redirection attempt.

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=friends+songs++masstamilan
    • http://files.mimismusic.org/uploads/1/3/0/9/130969592/kudofetutax-megos-gagibar-mofuvenagof.pdf
    • http://files.tampabaymodelrailroadclub.com/uploads/1/3/1/4/131409498/e8e11df305c5fd.pdf
    • http://bitivakij.lacostacanyontheatre.com/uploads/1/3/1/4/131453133/7d4f1662c.pdf
    • https://cdn.shopify
    • https://cdn.shopify.com/s/files/1/0435/6135/3371/files/diagnostic_assessment.pdf
    • https://cdn.shopify.com/s/files/1/0427/7790/3263/files/pikibolokawuzukukizigaf.pdf
    • https://cdn.shopify.com/s/files/1/0433/7526/3898/files/letters_and_their_sounds.pdf
    • https://cdn.shopify.com/s/files/1/0432/5661/0969/files/46439022764.pdf
    • https://cdn.shopify.com/s/files/1/0431/4267/6648/files/34443656204.pdf
    • https://cdn.shopify.com/s/files/1/0437/1900/0229/files/lazuguzavatizipaja.pdf
    • https://cdn.shopify.com/s/files/1/0432/7076/6750/files/82074665156.pdf
    • https://cdn.shopify.com/s/files/1/0440/0968/5150/files/probability_concepts_in_engineering_2nd_edition.pdf
    • https://cdn.shopify.com/s/files/1/0431/8288/2980/files/comptia_cysa_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/11067845032.pdf
    • https://cdn.shopify.com/s/files/1/0438/1805/7885/files/dukeditifusewafetuva.pdf
    • https://cdn.shopify.com/s/files/1/0431/5847/0810/files/betodiz.pdf
    • https://cdn.shopify.com/s/files/1/0431/1184/1949/files/gogekaxavotiwe.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_off0000db9f.bin
5dc6b9008ad8006d0e54afc7b5845b9c769cbdbe28cc19079dc455ace6815f88		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB9F 5100 bytes
font_01_sfnt_off0000ecdb.bin
0261469b4ba92a33934f60efbff7da1a826d1919f2bb61c73d67b0301e87ce3a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECDB 13992 bytes

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