Malicious PDF — malware analysis report

Static analysis result for SHA-256 da878ad8cc568471…

MALICIOUS

PDF

39.2 KB Created: 2020-08-04 07:02:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ee060374720d46bad5d76c8f1bf09145 SHA-1: 5fe3c96d90d9c37b79b601423bbdf08e30248a07 SHA-256: da878ad8cc568471820376d8e618261a91c7bf9353aeb758428cfbd9b000263d
152 Risk Score

Malware Insights

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

The PDF file contains a mass of external links, many pointing to shopify.com domains, designed to appear as search results for "Bangla history book pdf download". One of these links, https://ttraff.com/pify?keyword=bangla+history+book+pdf+download, is identified as a known malicious redirector. This suggests the document is part of a link farm or SEO poisoning campaign to drive traffic to malicious infrastructure. 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.com/pify?keyword=bangla+history+book+pdf+download
    • http://files.karamagreenhouses.org/uploads/1/3/1/3/131398250/6480046.pdf
    • http://files.service-netflix.com/uploads/1/3/1/4/131453068/51436c517b40762.pdf
    • http://files.hillscac.org/uploads/1/3/1/6/131607075/wiziwinazoralazutul.pdf
    • http://nadizabot.be-you-tiful.me/uploads/1/3/1/4/131437402/mosawoxuporox.pdf
    • https://cdn.shopify.com/s/files/1/0433/7631/2471/files/18770183727.pdf
    • https://cdn.shopify.com/s/files/1/0429/6772/8279/files/mefuvidilefupumojesigod.pdf
    • https://cdn.shopify.com/s/files/1/0437/7201/8845/files/wuvitixap.pdf
    • https://cdn.shopify.com/s/files/1/0436/0234/6148/files/begenufafezeweb.pdf
    • https://cdn.shopify.com/s/files/1/0433/0445/2246/files/vobapuwelitixugogilewexip.pdf
    • https://cdn.shopify.com/s/files/1/0440/5913/2056/files/5944413541.pdf
    • https://cdn.shopify.com/s/files/1/0436/1669/8526/files/80501137673.pdf
    • https://cdn.shopify.com/s/files/1/0433/3928/4645/files/17523932934.pdf
    • https://cdn.shopify.com/s/files/1/0430/3273/9989/files/36558249060.pdf
    • https://cdn.shopify.com/s/files/1/0427/9320/5916/files/4025916397.pdf
    • https://cdn.shopify.com/s/files/1/0428/6880/1695/files/69572737498.pdf
    • https://cdn.shopify.com/s/files/1/0428/4016/2470/files/64019776592.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/56751463133.pdf
    • https://cdn.shopify.com/s/files/1/0438/3942/2624/files/find_angle_between_two_points.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000480f.bin
7afdd01a8fe3cbae652747df6d21a0398f65a100aea0e27a4af35ac2af3df03d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x480F 5748 bytes
font_01_sfnt_off00005bb3.bin
682e85dab9490a247e8346de49d217df7862e35e467e55a3cb1748a0a3e8a3e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5BB3 5264 bytes
font_02_sfnt_off00006ce0.bin
bfbf39caf180b83d2f4d083d417028ac7b64254607d506ea1e5a021a92890a7d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CE0 10164 bytes

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