Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1c79930dbb80451…

MALICIOUS

PDF

46.0 KB Created: 2020-08-03 04:45:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c6582f7e0ec120118a31b99271f96fb0 SHA-1: 285e03126a04869906e63d181ff5908e31cd08c5 SHA-256: e1c79930dbb80451602d866bbfa603229b67582df3bca23bcced8a191f5bb2b0
152 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded links, many of which point to a link farm hosted on Shopify. One of these links, https://ttraff.com/pify?keyword=stihl+ms180c+manual, is identified as a malicious redirector. The document body, though heavily obfuscated, appears to contain the same lure text and URLs, suggesting the primary purpose is to trick users into clicking the malicious link. 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.com/pify?keyword=stihl+ms180c+manual
    • http://files.costumesandembroidery.com/uploads/1/3/1/4/131437806/fupowazemeluw.pdf
    • http://files.scsar.net/uploads/1/3/1/0/131070362/3b87502d59.pdf
    • http://files.centralcg.com/uploads/1/3/1/3/131398323/mibojivujipedulive.pdf
    • https://cdn.shopify.com/s/files/1/0431/1551/1968/files/bogigefirid.pdf
    • https://cdn.shopify.com/s/files/1/0440/5864/0534/files/89518128271.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/93880590480.pdf
    • https://cdn.shopify.com/s/files/1/0431/2177/0656/files/84819869425.pdf
    • https://cdn.shopify.com/s/files/1/0435/2992/8863/files/micrologix_1100_manual.pdf
    • https://cdn.shopify.com/s/files/1/0433/6759/6191/files/96873207001.pdf
    • https://cdn.shopify.com/s/files/1/0430/2041/9226/files/jawamoguvur.pdf
    • https://cdn.shopify.com/s/files/1/0435/6079/6318/files/dusamakoj.pdf
    • https://cdn.shopify.com/s/files/1/0435/2232/6696/files/femafobekifavipazo.pdf
    • https://cdn.shopify.com/s/files/1/0431/9592/4637/files/packers_vs_lions_predictions.pdf
    • https://cdn.shopify.com/s/files/1/0434/9971/6770/files/jizarawesijadubenukiguja.pdf
    • https://cdn.shopify.com/s/files/1/0434/5095/7974/files/fomotisefixu.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_off0000741e.bin
e9ac79f23f0b197426c131e8884df0af4d8020649f6d39fb874f6ace84a6fde1
pdf-font-stream PDF embedded font (sfnt) at offset 0x741E 5432 bytes
font_01_sfnt_off00008678.bin
db8f72555e901f304095ef63b5b888cdcd1a58523c1f514c5d7336e2aeaba8b0
pdf-font-stream PDF embedded font (sfnt) at offset 0x8678 10768 bytes