Malicious PDF — malware analysis report

Static analysis result for SHA-256 d366a0c18e7afa4e…

MALICIOUS

PDF

57.9 KB Created: 2020-07-29 09:15:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cc85da1083b0423a3c43f84467bb049a SHA-1: e8b8bb52d96a773fc2b433a19114a0f5392aa3b7 SHA-256: d366a0c18e7afa4ebb2dd9e38e01c6efa38fe33e8445665a6c6eaf85a96feb3b
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged as malicious by an ML classifier and contains numerous embedded links. One critical heuristic indicates the presence of a malicious redirector link pointing to 'ttraff.cc', and another identifies a large PDF link farm hosted on 'cdn.shopify.com'. The document body, though heavily obfuscated, appears to contain keywords related to coloring sheets, suggesting a lure.

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=dinosaur+coloring+sheets+for+kindergarten
    • http://files.heidischweizer.net/uploads/1/3/1/3/131381679/mozitinefizel.pdf
    • http://files.strawberrycookiekids.com/uploads/1/3/0/7/130775506/jirefan-jixoraw-birij-gupipexam.pdf
    • http://files.thebookwormlodge.com/uploads/1/3/2/3/132302787/mogaxe-jadepegowiw-vetovirafug-megaro.pdf
    • https://cdn.shopify.com/s/files/1/0434/1796/0604/files/58398595477.pdf
    • https://cdn.shopify.com/s/files/1/0430/6593/3985/files/fuxijoriwon.pdf
    • https://cdn.shopify.com/s/files/1/0432/9861/9557/files/tevanigumomitunopom.pdf
    • https://cdn.shopify.com/s/files/1/0428/3429/6988/files/10003139382.pdf
    • https://cdn.shopify.com/s/files/1/0431/9775/9643/files/37552085035.pdf
    • https://cdn.shopify.com/s/files/1/0429/9853/0201/files/29183357495.pdf
    • https://cdn.shopify.com/s/files/1/0437/8935/3118/files/82754256157.pdf
    • https://cdn.shopify.com/s/files/1/0437/7398/4919/files/zezugufizivikitunu.pdf
    • https://cdn.shopify.com/s/files/1/0432/1050/6404/files/28185860704.pdf
    • https://cdn.shopify.com/s/files/1/0433/8027/7406/files/55438156943.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_off0000a597.bin
850d67f23c20befb9f99ea914c5eb7c1fef083038e2e0f9a064fd9ff58535023
pdf-font-stream PDF embedded font (sfnt) at offset 0xA597 5228 bytes
font_01_sfnt_off0000b752.bin
7cfbe8e094a044a303a74df2a6b89d8f8cbb1f31b1a5d84449da2ce0d5cb3e06
pdf-font-stream PDF embedded font (sfnt) at offset 0xB752 10148 bytes