Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b3b4c51b5053e35…

MALICIOUS

PDF

40.1 KB Created: 2020-08-17 11:53:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 092421b7d7a8169af527c13993f6671c SHA-1: b2e7e63f67972110c4fcb1633cae9816eaa29b22 SHA-256: 4b3b4c51b5053e359ccb18655aeec5d1c079fe80786e3501ac6e3c3b320c4827
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.cc, which is disguised as a "chemical periodic table pdf". The document also functions as a link farm, pointing to numerous other PDF files hosted on Shopify. This suggests a campaign to distribute malicious content or engage in SEO manipulation. The ML classifier strongly supports the malicious verdict.

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=chemical+periodic+table+pdf
    • http://files.msgallardoela.com/uploads/1/3/1/4/131437655/c6817bb13b.pdf
    • https://cdn.shopify.com/s/files/1/0429/0369/9615/files/lelofitup.pdf
    • https://cdn.shopify.com/s/files/1/0430/4538/8442/files/9761135775.pdf
    • https://cdn.shopify.com/s/files/1/0431/2052/5469/files/34595848261.pdf
    • https://cdn.shopify.com/s/files/1/0433/8050/6785/files/bozajijomesotuke.pdf
    • https://cdn.shopify.com/s/files/1/0434/1448/7190/files/51879157533.pdf
    • https://cdn.shopify.com/s/files/1/0440/2606/9157/files/lunobidu.pdf
    • https://cdn.shopify.com/s/files/1/0428/0087/3631/files/kesafilijujifejoza.pdf
    • https://cdn.shopify.com/s/files/1/0432/2017/2957/files/70053696219.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kubogofire.pdf
    • https://cdn.shopify.com/s/files/1/0447/2481/3977/files/hal_leonard_the_beatles_complete_scores_book.pdf
    • https://cdn.shopify.com/s/files/1/0431/9880/8224/files/63531447546.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_off0000606c.bin
e5e5f92289f71618b791c7e6564244ab21c215135913534ea38c9d081a45273e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x606C 5260 bytes
font_01_sfnt_off0000721e.bin
ae446ef48106fa74ea8e10932cd18cbbe4b78187c9edd323ff4946c8b32ddaf3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x721E 9856 bytes

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