Malicious PDF — malware analysis report

Static analysis result for SHA-256 63e4ba7151f30da6…

MALICIOUS

PDF

60.4 KB Created: 2020-08-09 11:17:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 097462c1745a405e85f450fc9885a6db SHA-1: 5cc2496756700bef85a126e565115f209ad921fc SHA-256: 63e4ba7151f30da6df65bb83b6db2b212dba2ac0c470ed1e5536be0c6fb245c6
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm or SEO poisoning tactic. One prominent link, "https://ttraff.cc/pify?keyword=stereo+amplifier+circuit+diagram+pdf", is identified as a malicious redirector. The document body, though heavily obfuscated, also contains this URL, indicating an attempt to lure users to click on it. 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=stereo+amplifier+circuit+diagram+pdf
    • http://files.msbui.com/uploads/1/3/1/3/131381542/da4878b5.pdf
    • http://files.orchardhillsbangor.com/uploads/1/3/1/3/131383657/rulixigiliwogijiv.pdf
    • http://tabujume.homeinspectoralbuquerque.com/uploads/1/3/1/4/131453494/8239776.pdf
    • http://files.portisaacpottery.co.uk/uploads/1/3/2/6/132682829/599717.pdf
    • http://files.blackwinglabradors.com/uploads/1/3/0/8/130874612/mazivuk.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mosagewenusuwaguxizekud.pdf
    • https://cdn.shopify.com/s/files/1/0433/5173/6471/files/1189935796.pdf
    • https://cdn.shopify.com/s/files/1/0433/7483/7925/files/30839864056.pdf
    • https://cdn.shopify.com/s/files/1/0435/2226/1143/files/31949930912.pdf
    • https://cdn.shopify.com/s/files/1/0435/3412/3160/files/zirojuzibiwofunuxazawed.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/54903558396.pdf
    • https://cdn.shopify.com/s/files/1/0430/8054/8503/files/bodukeruriruxanalegepi.pdf
    • https://cdn.shopify.com/s/files/1/0428/7895/9775/files/bufuzowur.pdf
    • https://cdn.shopify.com/s/files/1/0430/1471/7599/files/54748988968.pdf
    • https://cdn.shopify.com/s/files/1/0437/8856/6677/files/best_to_word_converter_ocr.pdf
    • https://cdn.shopify.com/s/files/1/0432/7967/9656/files/kejadaxilijedirad.pdf
    • https://cdn.shopify.com/s/files/1/0433/2306/4488/files/chuyn_i_t_file_nh_sang_word.pdf
    • https://cdn.shopify.com/s/files/1/0427/8976/5276/files/48840458245.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b02a.bin
93ac25b448266babe45f75e2370bea2cf67e83782045fb1169867cbcadff5762		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB02A 5400 bytes
font_01_sfnt_off0000c271.bin
4d8910e8251b964d0f47785badfbf3b6f50bfae1827cb74d81df0f3c726c5731		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC271 9980 bytes

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