Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb86b1b3979ea195…

MALICIOUS

PDF

40.7 KB Created: 2020-08-07 10:22:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f276fdca5b7c5a671dfa071266302c9f SHA-1: 79bfedb64d5aa2dc1be962375b1d877c82f4b860 SHA-256: fb86b1b3979ea195dfe223a161f9cb0b9582b543cd3b46c4a6d8af7b7a2f873e
152 Risk Score

Malware Insights

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

The PDF contains a link to a redirector service, which is a common tactic for distributing malware or leading users to phishing sites. The document body, though heavily obfuscated, contains text related to 'analytical chemistry' and a URL that appears to be a lure for a free PDF download. The heuristic firings confirm the presence of malicious redirector links and a link farm, indicating a deliberate attempt to drive traffic to external resources. No scripts were extracted from this sample.

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=analytical+chemistry+an+introduction+7th+edition+pdf+free+download
    • http://files.northmiresouces.org/uploads/1/3/1/3/131384589/fakirorefamopar.pdf
    • http://files.uovooo.com/uploads/1/3/1/3/131378953/4553f49.pdf
    • http://files.chiclysoignebonviveur.com/uploads/1/3/0/7/130775308/rimasopoziku.pdf
    • http://fegujuxe.xtremeflair.com/uploads/1/3/0/7/130776326/2811488.pdf
    • https://cdn.shopify.com/s/files/1/0430/9952/1181/files/49004873202.pdf
    • https://cdn.shopify.com/s/files/1/0429/4174/3263/files/gajagekilonepizerela.pdf
    • https://cdn.shopify.com/s/files/1/0431/8769/9876/files/zekif.pdf
    • https://cdn.shopify.com/s/files/1/0432/4681/3344/files/albinismo_oculo_cutan.pdf
    • https://cdn.shopify.com/s/files/1/0436/5202/2430/files/riximevakomobajetefi.pdf
    • https://cdn.shopify.com/s/files/1/0432/1860/0103/files/39815395277.pdf
    • https://cdn.shopify.com/s/files/1/0432/9776/7592/files/femosaxowosigum.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/49726552648.pdf
    • https://cdn.shopify.com/s/files/1/0439/1282/2939/files/866_314_4207.pdf
    • https://cdn.shopify.com/s/files/1/0431/3550/0439/files/56216333617.pdf
    • https://cdn.shopify.com/s/files/1/0431/4536/3610/files/45089163063.pdf
    • https://cdn.shopify.com/s/files/1/0432/1126/0062/files/35344614561.pdf
    • https://cdn.shopify.com/s/files/1/0437/8345/4882/files/24660990014.pdf
    • https://cdn.shopify.com/s/files/1/0433/2378/5370/files/affairscloud_current_affairs_2020_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/6508/9949/files/shadow_clone_gungeon.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_off00005dfc.bin
6511e9f125929e32fdf333627b8c92a7835b8dc863010b9d32970a61f157b7e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5DFC 5656 bytes
font_01_sfnt_off00007132.bin
9202c5ffaafabb03f3238062608f80c7c18d92fa5c166bd71e9f7975fbf9a89f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7132 10640 bytes

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