Malicious PDF — malware analysis report

Static analysis result for SHA-256 721d8740a580e9a5…

MALICIOUS

PDF

38.5 KB Created: 2020-08-05 11:49:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 369fb5311caa2d188d0d3d1156cfd203 SHA-1: 2b4461931c8a93459240bc05cc320881852ef9c4 SHA-256: 721d8740a580e9a585d11f271861cd2f6dbb5f7f762d732266b0768e62ff9c77
154 Risk Score

Malware Insights

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

This PDF document contains numerous embedded links, with one identified as a known malicious redirector. The primary malicious URL is https://ttraff.com/pify?keyword=castrol+gtx5w30+c3+pdf, which likely leads to a phishing or malware distribution site. The presence of a large number of external PDF links suggests an attempt to manipulate search engine rankings or distribute content through a link farm. No scripts were extracted, but the embedded URLs are sufficient evidence of malicious intent.

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=castrol+gtx+5w30+c3+pdf
    • http://files.1stclasshomeopathy.com/uploads/1/3/0/8/130874416/zosibazugokibev.pdf
    • http://files.londahayden.com/uploads/1/3/1/6/131606056/gumixafa.pdf
    • http://files.buildingyoureternity.org/uploads/1/3/1/0/131070508/b92d882c25cd0b2.pdf
    • http://files.inmathclass.com/uploads/1/3/2/7/132712093/9080108.pdf
    • http://files.truthinaspectastrology.com/uploads/1/3/1/6/131606533/ee0a2403a7.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0440/5864/0534/files/wakumuno.pdf
    • https://cdn.shopify.com/s/files/1/0428/1984/6311/files/75900215868.pdf
    • https://cdn.shopify.com/s/files/1/0439/9936/3222/files/wetigopajoxuguzolugigo.pdf
    • https://cdn.shopify.com/s/files/1/0430/1121/1425/files/93338773852.pdf
    • https://cdn.shopify.com/s/files/1/0437/2607/8101/files/razekidom.pdf
    • https://cdn.shopify.com/s/files/1/0431/2691/5239/files/93714671940.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/biludetejuvujatolometa.pdf
    • https://cdn.shopify.com/s/files/1/0432/9557/2126/files/57644645815.pdf
    • https://cdn.shopify.com/s/files/1/0434/4587/8941/files/31588622128.pdf
    • https://cdn.shopify.com/s/files/1/0428/2023/9519/files/vusetinuwomewabe.pdf
    • https://cdn.shopify.com/s/files/1/0433/0625/4494/files/blackmagic_speed_test_windows.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/wemulaw.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004b23.bin
8d890b310b7fc0148347310b15bb63aa71ed39c503474fc72ca1b27dffb2ceab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4B23 5452 bytes
font_01_sfnt_off00005dd8.bin
c0bc40bef958ee60c1967fc5b0f15c7508ec79744e11b389e38d663ade7b4dc0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5DD8 9764 bytes
font_02_sfnt_off00007f45.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F45 4324 bytes

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