Malicious PDF — malware analysis report

Static analysis result for SHA-256 f15b60b83f9c425d…

MALICIOUS

PDF

41.5 KB Created: 2020-08-15 01:33:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7c357d990667a9e56975807da01ad31b SHA-1: b22131fa22e5b6a9160e11199eaf1661ed1e2c97 SHA-256: f15b60b83f9c425d577e3a7b9a3de3434b965c31821e40279f1be260dad9832c
120 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing for a malicious redirector link, specifically `https://ttraff.cc/pify?keyword=math+grade+7+book+pdf`. This link is presented to the user as a lure, disguised as a "math grade 7 book pdf". The document also exhibits characteristics of a link farm, embedding numerous other links to PDF files, likely to improve search engine ranking and distribute malicious traffic. No scripts were extracted from this sample.

Heuristics 3

  • 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.
  • 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=math+grade+7+book+pdf
    • http://files.neokymamessinias.org/uploads/1/3/0/7/130738970/tikazan.pdf
    • http://mujefulob.blythewaltrip.com/uploads/1/3/0/8/130874085/firavopujuponozasuk.pdf
    • http://nabot.sharifmatar.com/uploads/1/3/0/7/130775997/wilozegilukonitov.pdf
    • http://files.seasonalshowers.com/uploads/1/3/0/7/130775145/varubebun-wimitudelejoba.pdf
    • http://neburura.fournildejean.com/uploads/1/3/1/4/131453870/xitipaxevuz_davawaxovubigug_banipotizegase_tugajariribiz.pdf
    • https://cdn.shopify.com/s/files/1/0430/4489/6925/files/80465595856.pdf
    • https://cdn.shopify.com/s/files/1/0433/3685/9813/files/3103215990.pdf
    • https://cdn.shopify.com/s/files/1/0437/7647/5290/files/bass_guitar_notes_on_staff.pdf
    • https://cdn.shopify.com/s/files/1/0434/5551/2738/files/6769766475.pdf
    • https://cdn.shopify.com/s/files/1/0428/0261/0335/files/25563153400.pdf
    • https://cdn.shopify.com/s/files/1/0433/8260/3927/files/nginx_access_control_allow_origin.pdf
    • https://cdn.shopify.com/s/files/1/0434/7812/2649/files/35925521886.pdf
    • https://cdn.shopify.com/s/files/1/0430/2539/9971/files/financial_formulas_cheat_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0434/1088/2727/files/49797514025.pdf
    • https://cdn.shopify.com/s/files/1/0429/3355/1260/files/donirawubovawaxuxuzasup.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_off000063de.bin
3f11890e48adb22be8c6f4280d636cdb0661782dfbd1e9d2c1c733ef5db99c2b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63DE 5384 bytes
font_01_sfnt_off00007638.bin
12bb3d4102ec8dcce80a05e15b85a3e755f06148770f1aba09dd620100ba982f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7638 10368 bytes

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