Malicious PDF — malware analysis report

Static analysis result for SHA-256 280a45fe0f0eb11f…

MALICIOUS

PDF

43.7 KB Created: 2020-08-06 13:13:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ee89ca5bfaf233ca81662d887dab8960 SHA-1: 9e337519e6fe668bb904791afbf6e0b2f92c2b29 SHA-256: 280a45fe0f0eb11ff8a95e791edae34215d5d4f98f1a65e9168ba3043422bed1
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/pify?keyword=cover+letter+sample+pdf'. This indicates the document's primary purpose is to lure the user to a malicious site. The presence of numerous other PDF links, many hosted on cdn.shopify.com, suggests a link farm or SEO poisoning tactic to increase visibility. No scripts were extracted, but the embedded URLs are sufficient to determine the 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.cc/pify?keyword=cover+letter+sample+pdf
    • http://files.newlifeduarte.org/uploads/1/3/0/7/130739028/mamokumi-varotapuzurizum.pdf
    • http://files.rb-tactical.com/uploads/1/3/0/7/130738998/fc1ca480bc286.pdf
    • http://files.agentsreferralnetwork.com/uploads/1/3/0/7/130738564/1954539.pdf
    • http://files.wyandotelementarypto.org/uploads/1/3/1/3/131380625/vawudiwomonun.pdf
    • http://files.deborahvoss.com/uploads/1/3/0/8/130815726/jusawiman.pdf
    • https://cdn.shopify.com/s/files/1/0431/5817/5893/files/59102046552.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/juzopuzenafososokazulu.pdf
    • https://cdn.shopify.com/s/files/1/0428/5209/0022/files/56571790974.pdf
    • https://cdn.shopify.com/s/files/1/0432/1171/8820/files/rojiziges.pdf
    • https://cdn.shopify.com/s/files/1/0428/3708/2271/files/botefov.pdf
    • https://cdn.shopify.com/s/files/1/0438/0485/2386/files/ffxi_nin_guide.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/lofexunixepufatomubudabak.pdf
    • https://cdn.shopify.com/s/files/1/0433/2965/0843/files/segowesilevejefetubivomu.pdf
    • https://cdn.shopify.com/s/files/1/0429/8535/7463/files/elementary_statistics_bluman_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/1136/6309/files/84050496772.pdf
    • https://cdn.shopify.com/s/files/1/0432/7034/0772/files/99404609634.pdf
    • https://cdn.shopify.com/s/files/1/0432/5359/6310/files/7286630112.pdf
    • https://cdn.shopify.com/s/files/1/0433/6225/5006/files/bevoxojezarepeba.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_off00006d76.bin
1178fb8e60be6a524f71c5decd7b6e8647d1122e671c2b73cd6a253f787bfe94		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D76 5152 bytes
font_01_sfnt_off00007eec.bin
52b93cab87c83926b59f8ce216b21782483e924ee932baa0fbf7d03f74a7b797		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7EEC 10168 bytes

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