Malicious PDF — malware analysis report

Static analysis result for SHA-256 62d4684da1050d17…

MALICIOUS

PDF

41.6 KB Created: 2020-08-18 17:51:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8250dfd7c89b71c413f7c891758441ea SHA-1: 0ba9f08185b6c685fd8a244fa7c23b92991616af SHA-256: 62d4684da1050d17f8b58287ef638e926231accea518a295d70c6932aafd072a
154 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link that leads to a link farm hosting 16 other PDF files, indicating a phishing or scam attempt. The document body text, though partially obfuscated, contains the malicious URL and appears to be a lure related to a resignation notice. 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=cerere+demisie+cu+acordul+ambelor+pdf
    • http://lusibok.senmccartney.com/uploads/1/3/0/7/130739695/ed0e5564.pdf
    • http://files.christiansciencecrystallake.org/uploads/1/3/0/7/130739210/1830638.pdf
    • http://files.forzarealty.com/uploads/1/3/0/7/130775725/4544696.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0450/6163/6259/files/akuntansi_manajemen_rudianto.pdf
    • https://cdn.shopify.com/s/files/1/0450/3499/5870/files/adverbs_worksheet_grade_5.pdf
    • https://cdn.shopify.com/s/files/1/0435/9271/2349/files/23716844069.pdf
    • https://cdn.shopify.com/s/files/1/0439/9045/0334/files/pexurogelotep.pdf
    • https://cdn.shopify.com/s/files/1/0432/6529/4504/files/arduino_mega_2560_r2_schematic.pdf
    • https://cdn.shopify.com/s/files/1/0434/1796/0604/files/largest_city_in_the_us.pdf
    • https://cdn.shopify.com/s/files/1/0440/0100/1630/files/36664982524.pdf
    • https://cdn.shopify.com/s/files/1/0431/7977/0019/files/goposurizuxisotolidamuw.pdf
    • https://cdn.shopify.com/s/files/1/0428/2020/6758/files/46656554003.pdf
    • https://cdn.shopify.com/s/files/1/0432/5307/2022/files/migakowa.pdf
    • https://cdn.shopify.com/s/files/1/0432/7574/7484/files/bank_logins_for_sale.pdf
    • https://cdn.shopify.com/s/files/1/0428/7594/5113/files/53070935003.pdf
    • https://cdn.shopify.com/s/files/1/0429/9007/6067/files/71365414466.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_off00005a7b.bin
7c4031241c5136e3ba9f0efcdcacb151d1727b615a2b710f6fabd5bf81c8355f
pdf-font-stream PDF embedded font (sfnt) at offset 0x5A7B 5344 bytes
font_01_sfnt_off00006c82.bin
68c3fccb1ddb847a6abf848df5bfdeaa3f4a3e817bc7b238060abbb9fb2f8413
pdf-font-stream PDF embedded font (sfnt) at offset 0x6C82 14276 bytes