Malicious PDF — malware analysis report

Static analysis result for SHA-256 18a9abc033967366…

MALICIOUS

PDF

52.0 KB Created: 2020-08-06 00:28:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f2c67d86dda36eeb9d275f0572ce066d SHA-1: ed6d18c8b4a67ab7409d7726d5d26c097689166d SHA-256: 18a9abc033967366617c0185bcff719efd0ac70e3cca5b9648644dbd3812bf69
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a heuristic firing for linking to known malicious redirector infrastructure, specifically `https://ttraff.cc/pify?keyword=binomial+expansion+worksheet+with+answers+pdf`. It also exhibits characteristics of a link farm, with numerous embedded URLs pointing to PDF files, likely for SEO manipulation or to host further malicious content. The document body, though heavily obfuscated, contains the same lure text and URLs, suggesting an attempt to disguise malicious links as legitimate educational content.

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=binomial+expansion+worksheet+with+answers+pdf
    • http://files.springshine.us/uploads/1/3/1/3/131384127/sulezogop-judaz-kazavo-virukide.pdf
    • http://files.gftrails.ca/uploads/1/3/2/6/132681409/79e1a4c.pdf
    • http://files.aikenhistoryfchs.com/uploads/1/3/0/8/130873876/7992591.pdf
    • http://fontawesome.iohttp://fontawesome.io/license/
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.thdl.org/http://www.thdl.org/Tibetan
    • https://cdn.shopify.com/s/files/1/0429/9938/2170/files/18_wheeler_games.pdf
    • https://cdn.shopify.com/s/files/1/0434/6124/7129/files/nufukexetowewurij.pdf
    • https://cdn.shopify.com/s/files/1/0428/2312/3100/files/94703965743.pdf
    • https://cdn.shopify.com/s/files/1/0428/2764/5095/files/wow_classic_alliance_leveling_guide.pdf
    • https://cdn.shopify.com/s/files/1/0436/9353/9478/files/31651721249.pdf
    • https://cdn.shopify.com/s/files/1/0432/8855/9780/files/50072251915.pdf
    • https://cdn.shopify.com/s/files/1/0436/9232/7077/files/ctfd_urban_dictionary.pdf
    • https://cdn.shopify.com/s/files/1/0437/9063/1064/files/54710791914.pdf
    • https://cdn.shopify.com/s/files/1/0439/8009/5646/files/jinagiwetipof.pdf
    • https://cdn.shopify.com/s/files/1/0431/8307/9592/files/74757461947.pdf
    • https://cdn.shopify.com/s/files/1/0431/2639/0933/files/lagidemuguzowepele.pdf
    • https://cdn.shopify.com/s/files/1/0430/4093/1991/files/tasugojum.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/
    • http://scripts.sil.org/OFL
    • http://www.gnu.org/licenses/
    • http://www.gnu.org/copyleft/gpl.htmlTibetan

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005f61.bin
7876478bc1659113fdbebf3a35f037dd7887dec3e659be552acae2fe74d5f969		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F61 5368 bytes
font_01_sfnt_off000072bd.bin
a8ccca06eb2a19973cc3425bf046e8ccb8ea375452e14ea4f69b66bca8a124da		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72BD 5556 bytes
font_02_sfnt_off0000858c.bin
584c3d44c808ca6d9c2067965d1c7d2ec9bd3674b3ba40a4947ed5f73df8ff88		 pdf-font-stream PDF embedded font (sfnt) at offset 0x858C 8668 bytes
font_03_sfnt_off00009673.bin
d75ab4553347cefca713c07c225015f7aefac4020ff0f0c3bc40833efaa43aba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9673 13920 bytes

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