Malicious PDF — malware analysis report

Static analysis result for SHA-256 448b9580915ca7c8…

MALICIOUS

PDF

33.8 KB Created: 2020-08-17 15:24:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dbd73454f53ff1ee0a2aefbb25ced8c1 SHA-1: ac5dfc4330b81c8b264f90e3081872f0499dc848 SHA-256: 448b9580915ca7c81643d1ffb26c0642398a0af03d59bdaaf289b2076cc56690
154 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, with one specifically identified as a malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, suggesting an attempt to manipulate search engine results or distribute content through a link farm. The ML classifier strongly supports the malicious nature of this PDF. The primary malicious IOC is the redirector URL.

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=kannada+janapada+video+songs
    • http://files.swtablechair.com/uploads/1/3/0/8/130814115/1491046.pdf
    • http://jofije.katiesgarden.co.uk/uploads/1/3/1/3/131398054/ededc7a2aec42fc.pdf
    • http://files.euphoriacalm.com/uploads/1/3/2/3/132303270/4509138.pdf
    • http://takudiwu.esthercatherinemusic.com/uploads/1/3/2/6/132682659/fijokutuz.pdf
    • https://cdn.shopify.com/s/files/1/0432/5523/4710/files/makkar_ielts_writing_task_1.pdf
    • https://cdn.shopify.com/s/files/1/0430/9119/8112/files/sekawil.pdf
    • https://cdn.shopify.com/s/files/1/0437/0733/4810/files/arkanaut_company.pdf
    • https://cdn.shopify.com/s/files/1/0430/6888/3098/files/32211903967.pdf
    • https://cdn.shopify.com/s/files/1/0429/7749/3146/files/police_nsw_report_lost_property.pdf
    • https://cdn.shopify.com/s/files/1/0433/2378/5370/files/semefojunose.pdf
    • https://cdn.shopify.com/s/files/1/0434/7399/3890/files/13425294346.pdf
    • https://cdn.shopify.com/s/files/1/0435/8550/3393/files/crebro_humano_anatomia.pdf
    • https://cdn.shopify.com/s/files/1/0429/3869/5846/files/brother_p-_touch_label_maker_manual.pdf
    • https://cdn.shopify.com/s/files/1/0430/7006/2754/files/pewedunozatibepiravuroko.pdf
    • https://cdn.shopify.com/s/files/1/0436/1977/8723/files/introduction_to_public_policy_making.pdf
    • https://cdn.shopify.com/s/files/1/0434/2317/0710/files/55007442020.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_off0000499a.bin
bbf0764efb22d3a65b5b7eefa43440e2d00f01ef1d305b8fa90e0d7a05b9555a
pdf-font-stream PDF embedded font (sfnt) at offset 0x499A 5104 bytes
font_01_sfnt_off00005b20.bin
90d2012c9c5ac387d9ed90a35bcf1f10b37ad7493fb865cf0a211345bf1d722c
pdf-font-stream PDF embedded font (sfnt) at offset 0x5B20 9120 bytes