Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8b6ecfd49162103…

MALICIOUS

PDF

55.6 KB Created: 2020-08-06 01:31:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f22432b4f227083a1c886c93cab15bcd SHA-1: 67df0bf09bff379adb459705c080e2e9923afd54 SHA-256: d8b6ecfd49162103edbdf17488eedef014ba120ba8f111b5483566951cc4e928
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.ru, which is disguised as a search result for educational materials. The document body, though heavily obfuscated, contains the target search query and the malicious URL. The presence of numerous links to external PDFs, many hosted on potentially compromised Shopify domains, suggests a link farm or SEO poisoning tactic to distribute malicious content. 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.ru/pify?keyword=ncert+biology+textbook+for+class+12+pdf
    • http://files.fitzscoonshack.com/uploads/1/3/1/8/131871705/97ef3c88.pdf
    • http://kezab.lonepinefarmnubians.com/uploads/1/3/1/4/131407535/9188924.pdf
    • http://files.rootedandrestored.org/uploads/1/3/0/7/130775845/lefebapisifibamiwapa.pdf
    • http://files.shorelinebass.com/uploads/1/3/1/1/131164520/2518813.pdf
    • https://cdn.shopify.com/s/files/1/0430/6065/8330/files/94216259696.pdf
    • https://cdn.shopify.com/s/files/1/0438/2962/4992/files/20412935491.pdf
    • https://cdn.shopify.com/s/files/1/0431/9825/1165/files/55953353493.pdf
    • https://cdn.shopify.com/s/files/1/0450/2405/1358/files/azir_pro_builds.pdf
    • https://cdn.shopify.com/s/files/1/0435/5883/0229/files/ford_600_tractor_service_manual.pdf
    • https://cdn.shopify.com/s/files/1/0427/8406/3654/files/wekolalixonadasisidigesi.pdf
    • https://cdn.shopify.com/s/files/1/0440/7836/6885/files/54410347821.pdf
    • https://cdn.shopify.com/s/files/1/0433/6248/4383/files/afaan_oromoo_books.pdf
    • https://cdn.shopify.com/s/files/1/0435/7816/3359/files/zerabumulo.pdf
    • https://cdn.shopify.com/s/files/1/0435/2750/4024/files/97121771884.pdf
    • https://cdn.shopify.com/s/files/1/0430/2385/9873/files/kimomegif.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_off00008c9a.bin
514b04e02e494a0ed24e3eaf37e338320b0e45859eef15d236139d91b2c18ccc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C9A 5848 bytes
font_01_sfnt_off0000a0b0.bin
7b677ffd797a28400ec69ae46b04484c2a65d1caf12ea2e5b6ccce6543f89da8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA0B0 10640 bytes
font_02_sfnt_off0000c541.bin
dd1509e35b939bb573195ffc7679b77f734ca275a30758edc4f954a959586419		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC541 3060 bytes

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