Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2f44d732f844fa3…

MALICIOUS

PDF

79.3 KB Created: 2020-09-16 17:50:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cec8eb17133d5aa9ed349f733f8a3ea3 SHA-1: 66a05b51add54a0c23aaad9d4dd4d1da45293278 SHA-256: f2f44d732f844fa3dab34349ee6c67c0fcda6f74878a586eb0e92093bf537b2d
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files, characteristic of a link farm or SEO poisoning attack. One critical heuristic identified a link to known malicious redirector infrastructure, suggesting the intent is to lead users to malicious sites. The document body, though partially obfuscated, contains text that appears to be a lure for an episode guide, further supporting the malicious 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.link/wix?keyword=it+started+with+a+kiss+episode+guide
    • http://files.tcmphoto.com/uploads/1/3/1/3/131380641/8355327.pdf
    • http://gusatub.sttammanywoodworkersguild.com/uploads/1/3/2/8/132816036/47e21.pdf
    • http://tujilezu.newportplusboardriders.com/uploads/1/3/2/3/132303382/c803c9.pdf
    • http://vetosavo.nordiclilly.com/uploads/1/3/0/9/130969723/3495386.pdf
    • https://cdn.shopify.com/s/files/1/0438/5275/9190/files/17202907826.pdf
    • https://cdn.shopify.com/s/files/1/0435/4441/2309/files/warawapavanexajawi.pdf
    • https://cdn.shopify.com/s/files/1/0432/1162/0509/files/ziruwakafumedab.pdf
    • https://fd7fc72b-55a2-4576-91ce-f7a3ecd4c428.filesusr.com/ugd/d7d6cd_6d4a913cfd264bcf9c4af1918aa6e969.pdf?index=true
    • https://393f7a50-d763-4c01-9d7f-2b8d2cf0c947.filesusr.com/ugd/3cb679_5f7f1331f0fa48408857ff3971ec63da.pdf?index=true
    • https://bad34726-dd57-4a81-b16f-12a794e2eb40.filesusr.com/ugd/bfbc46_f6a6404ffd864f2c97df0b57ed73418d.pdf?index=true
    • https://9375e084-0356-4d97-891c-7e1f837ebc58.filesusr.com/ugd/2486b5_c4cc6defc6e7400b90634a2291d42c1f.pdf?index=true
    • https://3571733d-efe9-49ba-8b60-58fd51ec829f.filesusr.com/ugd/6f53d7_2c29f6e742a14aff99f54be123c91ae4.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0431/8245/7000/files/9._1_adding_and_subtracting_rational_expressions.pdf
    • https://cdn.shopify.com/s/files/1/0433/2303/1720/files/64467356028.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000073c5.bin
6dd9b0ebd74f2da3016a57451ef993fe5181885e57c6a1b74bb65932aee6df5a		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x73C5 35976 bytes
stream_005_off0000f2ec.bin
ce5f52d24a50d369140bc0c6eff69db127484ac60cacd2b1d2f40fcdae8a3f12		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xF2EC 8812 bytes
font_01_sfnt_off0000e0f3.bin
527b1b4f9fed1dcb064204e61256f0fc90869708c5fe108ef9c35d9f15dc2a1c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE0F3 5280 bytes
font_03_sfnt_off00010b68.bin
86232f5daf5b7b740974d1f49247f0c4cdde55ee2b34d990dfec4809593a9a21		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B68 10564 bytes

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