Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3caad88f8b907f3…

MALICIOUS

PDF

54.3 KB Created: 2020-07-23 22:15:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 153733a9f2d78fc2267578a969a926ff SHA-1: 4ff09c1a3104878b95c4ef352624f7b9b850de30 SHA-256: a3caad88f8b907f344d5d0aa11a47aca2295bc1e1f9a945599c6c0d1bcf942e1
152 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, pointing to 'https://ttraff.com/pify?keyword=bfs+application+form'. This URL is likely part of a phishing campaign, attempting to trick users into downloading further malware or visiting malicious sites. The document also contains a large number of embedded links, many hosted on Shopify, which is characteristic of SEO link farm abuse for traffic redirection.

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=bfs+application+form
    • http://files.thesilkveil.com/uploads/1/3/0/7/130740069/7159512cb.pdf
    • http://files.hrstruehope.org/uploads/1/3/0/7/130739601/dipipebitoxu.pdf
    • http://files.tudorinteriorblinds.com/uploads/1/3/1/4/131406827/5e7c4791.pdf
    • http://files.strategicmotv8r.com/uploads/1/3/1/3/131380107/diditupifetiwoneraza.pdf
    • http://files.strateg
    • https://cdn.shopify.com/s/files/1/0430/9493/3665/files/mewimozasezukazafot.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/909040323.pdf
    • https://cdn.shopify.com/s/files/1/0428/3963/8179/files/58906156471.pdf
    • https://cdn.shopify.com/s/files/1/0434/4394/5622/files/jeretegofinajo.pdf
    • https://cdn.shopify.com/s/files/1/0433/5036/0232/files/lalawexilovidadugonoxana.pdf
    • https://cdn.shopify.com/s/files/1/0432/3993/2064/files/77478197311.pdf
    • https://cdn.shopify.com/s/files/1/0432/5307/2022/files/98815580300.pdf
    • https://cdn.shopify.com/s/files/1/0431/4179/1895/files/gotejak.pdf
    • https://cdn.shopify.com/s/files/1/0434/5479/1832/files/38419274733.pdf
    • https://cdn.shopify.com/s/files/1/0430/6750/6849/files/tamosuboxobasamup.pdf
    • https://cdn.shopify.com/s/files/1/0433/3197/7370/files/pijefulawirigufosusepu.pdf
    • https://cdn.shopify.com/s/files/1/0430/9565/4554/files/79236254984.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/babasetaxoguvivowe.pdf
    • https://cdn.shopify.com/s/files/1/0430/3123/2674/files/bidepagurinevodo.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_off00007c13.bin
67424e285a2d790bb803df027a15ffb46e7997321bd82bd4014984fcc135605d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C13 4880 bytes
font_01_sfnt_off00008c77.bin
be37fa055e3b2f1359b3898eb13667d5ccd3c15a4a2c6bfc9334d46ab0e65d75		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C77 12644 bytes
font_02_sfnt_off0000b5e8.bin
9fdc882819f9b72766a5e3b891b8cd8dee55911a2d9d4fe89a7be174003378d5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB5E8 16180 bytes

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