Malicious PDF — malware analysis report

Static analysis result for SHA-256 c25aa99264d63d31…

MALICIOUS

PDF

50.6 KB Created: 2020-07-30 13:24:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ddad4c2e23db20d17d28b65c6b1dc015 SHA-1: d008c5dd084334818ac604107d9565bbe4b10fa3 SHA-256: c25aa99264d63d3148dbe733efe58bc9017145073efa35b4c71252757fe7d7ea
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. This URL is part of a link farm designed to manipulate search engine results, as indicated by the 'PDF_SEO_LINK_FARM' heuristic. The document body, though heavily obfuscated, contains text related to 'Baby s day out book pdf free download', suggesting a lure for users seeking content. The ML classifier also strongly flagged this PDF as malicious.

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=baby+s+day+out+book+pdf+free+download
    • http://files.allergyeasyliving.com/uploads/1/3/0/8/130814177/581786.pdf
    • http://files.cathymoklebust.com/uploads/1/3/1/3/131381109/ec3e95b8b.pdf
    • http://files.amyandrewsmusic.com/uploads/1/3/0/7/130740483/af97d35e7054386.pdf
    • http://files.freeoursexuality.com/uploads/1/3/1/8/131857120/masoxesifowug-wemad-zizos-tuzuxexuw.pdf
    • http://files.jogscotland-aberdeen.org/uploads/1/3/1/6/131606092/c434d6.pdf
    • https://cdn.shopify.com/s/files/1/0432/0549/2904/files/mitisexugizen.pdf
    • https://cdn.shopify.com/s/files/1/0437/3617/0657/files/lanefuvixazobodiwopoz.pdf
    • https://cdn.shopify.com/s/files/1/0434/6196/8025/files/9375581823.pdf
    • https://cdn.shopify.com/s/files/1/0430/0718/0954/files/14171168880.pdf
    • https://cdn.shopify.com/s/files/1/0428/4314/4359/files/zozag.pdf
    • https://cdn.shopify.com/s/files/1/0428/8489/0790/files/bevidemonimupavizesolo.pdf
    • https://cdn.shopify.com/s/files/1/0430/4538/8437/files/fokexinuliwutokiru.pdf
    • https://cdn.shopify.com/s/files/1/0429/3056/9382/files/vajewaza.pdf
    • https://cdn.shopify.com/s/files/1/0427/5470/3526/files/35499648493.pdf
    • https://cdn.shopify.com/s/files/1/0435/8632/2600/files/janifewelakek.pdf
    • https://cdn.shopify.com/s/files/1/0433/4842/6920/files/tidurevitigadir.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_off00007667.bin
512f45a0f5a85ca89fa1489698d62f4e4c63aba7e30bce68d348b14d7d2b45c1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7667 5316 bytes
font_01_sfnt_off0000888a.bin
d2d10b6b0c668cf26faa9347c7054f8580c7eefa5cb7aecda2a4fba74bd025f0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x888A 6068 bytes
font_02_sfnt_off0000983b.bin
058651dc7872a7dbb35d55a30db3fcff6ffc4fac27dfeafd07d774d9a1ea8e05		 pdf-font-stream PDF embedded font (sfnt) at offset 0x983B 10668 bytes

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