Malicious PDF — malware analysis report

Static analysis result for SHA-256 44be332bd257d8d9…

MALICIOUS

PDF

37.7 KB Created: 2020-08-24 17:11:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fb389b9b30105404f0bed6088223fdd0 SHA-1: 0eecc7e895bf4e53cf46936febfffbb104c95d8d SHA-256: 44be332bd257d8d9a4fea3a7ae524de5c15e09fa0498d14001612cbf3ad7652f
152 Risk Score

Malware Insights

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

The PDF was flagged as malicious by a machine learning model and contains a critical heuristic indicating it links to known malicious redirector infrastructure. It also exhibits a PDF link farm, with numerous links pointing to external PDFs, many hosted on cdn.shopify.com. The primary malicious URL identified is https://ttraff.com/pify?keyword=akhiyan+song++mr+jatt+by+barbie, which is likely used to redirect users to a phishing or scam page. No scripts were extracted, and the document body is heavily obfuscated.

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=akhiyan+song++mr+jatt+by+barbie
    • http://files.sanpeteseamless.com/uploads/1/3/0/7/130738748/4733625.pdf
    • https://cdn.shopify.com/s/files/1/0429/9938/2170/files/acids_and_bases_grade_12.pdf
    • https://cdn.shopify.com/s/files/1/0449/6978/7560/files/88373832159.pdf
    • https://cdn.shopify.com/s/files/1/0437/0215/7466/files/52002219801.pdf
    • https://cdn.shopify.com/s/files/1/0435/5486/5320/files/77510746456.pdf
    • https://cdn.shopify.com/s/files/1/0431/8894/5064/files/pisuko.pdf
    • https://cdn.shopify.com/s/files/1/0430/9201/7305/files/tidajoxuzoz.pdf
    • https://cdn.shopify.com/s/files/1/0429/6962/8828/files/mitsubishi_eclipse_service_manual.pdf
    • https://cdn.shopify.com/s/files/1/0427/6387/8566/files/89547425189.pdf
    • https://cdn.shopify.com/s/files/1/0433/9050/1020/files/53644991159.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_off00004b3e.bin
c115e85501730cce4d843b38c844d5522c4b8bba12f8860b5adc4d61da40a13a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4B3E 5440 bytes
font_01_sfnt_off00005d9c.bin
cb707c344ae46212e7c788fb12b333c62ee652d849393863f875d4388092a2e7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D9C 13604 bytes

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