Malicious PDF — malware analysis report

Static analysis result for SHA-256 35908bc32e7c2333…

MALICIOUS

PDF

51.1 KB Created: 2020-07-30 05:38:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e95938351ac5b5ddd9a78f31dd3a0ee2 SHA-1: 19ca74b8040ebac91e55a8f55e4934f8d3e870f4 SHA-256: 35908bc32e7c23339da13cae6c7e290bb9811447728021d4e4b3f05ab1672b0d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link T1059.001 PowerShell

The PDF contains numerous embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, suggests a lure related to 'difficult equivalent resistance problems with solutions pdf'. The presence of a link farm heuristic further indicates an attempt to manipulate search results or distribute malicious content. The ML classifier 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.cc/pify?keyword=difficult+equivalent+resistance+problems+with+solutions+pdf
    • http://files.tennesseebahaischool.org/uploads/1/3/1/4/131438068/0ab560da.pdf
    • http://files.unfinishedvictory.com/uploads/1/3/1/6/131606248/5504888.pdf
    • http://files.alimaclaurin.net/uploads/1/3/0/8/130813458/866c01b861.pdf
    • http://files.swfva.com/uploads/1/3/1/0/131070559/9aa26.pdf
    • https://cdn.shopify.com/s/files/1/0438/2877/3021/files/79530890127.pdf
    • https://cdn.shopify.com/s/files/1/0434/8834/6262/files/jovudelizokoxav.pdf
    • https://cdn.shopify.com/s/files/1/0430/5253/1869/files/nogizixeneki.pdf
    • https://cdn.shopify.com/s/files/1/0428/8207/2732/files/fitufuxisiwosuzebovar.pdf
    • https://cdn.shopify.com/s/files/1/0429/8833/9361/files/vijizunewuxurimugarikuma.pdf
    • https://cdn.shopify.com/s/files/1/0433/7437/9158/files/topawadizevunizubesasul.pdf
    • https://cdn.shopify.com/s/files/1/0431/3006/0955/files/gefotafetotibamepopuk.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/16946396068.pdf
    • https://cdn.shopify.com/s/files/1/0431/0273/2448/files/bifoliwomewobuw.pdf
    • https://cdn.shopify.com/s/files/1/0430/9418/0001/files/93731609790.pdf
    • https://cdn.shopify.com/s/files/1/0430/8058/1274/files/xizoxewikuwul.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_off00007468.bin
23e1f1949c9047352a8a0123bff950233666c1b14b91178a44c6b08cdf57f426		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7468 5692 bytes
font_01_sfnt_off000087a0.bin
332fc992def822264a39f3b85ab5aaec874b250c928fd8bedfe94393e9e2acdc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x87A0 9824 bytes
font_02_sfnt_off0000a965.bin
3881ac036e24d18d946d46924f2e53d0ed0d4a9afaeaebdb2d2c90068baec180		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA965 16240 bytes

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