Malicious PDF — malware analysis report

Static analysis result for SHA-256 40d7122a0fc58e20…

MALICIOUS

PDF

42.0 KB Created: 2020-08-11 15:10:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c5574a240caff48bd9ec5e99c2e4e0a1 SHA-1: 34d57abd75e36d21b8d7678a15e0a5cb7e52dcfc SHA-256: 40d7122a0fc58e2026ba0df3a4095c93eed93ffd042d5120d53e94746f989552
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external resources. One critical heuristic identified a link to a known malicious redirector, `https://ttraff.cc/pify?keyword=electrical+pvc+conduit+fittings+pdf`, which is likely intended to lead the user to a malicious site. The document body, though heavily obfuscated, contains text related to 'electrical pvc conduit fittings pdf' and references the wkhtmltopdf tool, suggesting a lure to download or view specific content. The presence of numerous SEO-optimized PDF links further indicates a link farm or redirection strategy.

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=electrical+pvc+conduit+fittings+pdf
    • http://jizuvage.holmescreekbc.com/uploads/1/3/0/8/130813821/2d45fff24.pdf
    • http://wovenomu.lonelydoggallery.com/uploads/1/3/0/7/130775982/soxabakigamogavedef.pdf
    • http://files.jordanjclark.com/uploads/1/3/1/4/131407424/fezidov.pdf
    • http://zawuru.holidaywindowpaint.com/uploads/1/3/1/6/131606289/f8b052a83a4fa.pdf
    • https://cdn.shopify.com/s/files/1/0429/2929/1427/files/nimakukejizamuv.pdf
    • https://cdn.shopify.com/s/files/1/0432/2931/5229/files/rujanuvilazedivexanoga.pdf
    • https://cdn.shopify.com/s/files/1/0439/0918/5688/files/begenomavefiset.pdf
    • https://cdn.shopify.com/s/files/1/0429/5072/1699/files/junojedaru.pdf
    • https://cdn.shopify.com/s/files/1/0440/4376/3862/files/5034774257.pdf
    • https://cdn.shopify.com/s/files/1/0430/6518/0314/files/49616752016.pdf
    • https://cdn.shopify.com/s/files/1/0431/1977/1799/files/dupesowilogadibokomikupu.pdf
    • https://cdn.shopify.com/s/files/1/0447/8858/0512/files/english_to_assamese_dictionary_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/5127/0823/files/4592936672.pdf
    • https://cdn.shopify.com/s/files/1/0431/6086/2882/files/gaxunidugipirigovus.pdf
    • https://cdn.shopify.com/s/files/1/0432/8580/7269/files/balituregekeloberemizalu.pdf
    • https://cdn.shopify.com/s/files/1/0429/8289/9871/files/skyrim_se_save_cleaner.pdf
    • https://cdn.shopify.com/s/files/1/0448/0902/7735/files/financial_peace_budget_forms.pdf
    • https://cdn.shopify.com/s/files/1/0428/1827/3446/files/26358994491.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_off00006641.bin
daa1cc97a66aa87c6b1c513a9090feb545af794f23cb5ab1b027b09033aec3be		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6641 5340 bytes
font_01_sfnt_off0000787f.bin
7bc25be53b73526615d79999e78baae47ac267b9b9ef303023bfb9a13bdd1c2d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x787F 10080 bytes

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