Malicious PDF — malware analysis report

Static analysis result for SHA-256 af62717577200f5f…

MALICIOUS

PDF

47.3 KB Created: 2020-08-07 07:49:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c822f5022f9da9e26fb05457786816f1 SHA-1: c4ef911bed596d9e59b471ae83eb61cb34093381 SHA-256: af62717577200f5f821504766d37f33135693bcec8a0850a8ad1054336151b64
152 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on Shopify, suggesting a link farm or SEO poisoning attempt. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.cc/pify?keyword=13th+amendment+worksheet+pdf'. The document body, though heavily obfuscated, contains text related to '13th amendment worksheet pdf', likely a lure. The ML classifier strongly indicated maliciousness.

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=13th+amendment+worksheet+pdf
    • http://files.nlg-pros.com/uploads/1/3/0/9/130969910/katixiratowapo.pdf
    • http://files.koahspearguns.com/uploads/1/3/0/8/130813849/worabugesezu_fowipe.pdf
    • http://files.devotedtotheking.org/uploads/1/3/0/7/130776381/xuxemav-sipadegetin-busenogivokot.pdf
    • http://kakimogen.triplethreatns.com/uploads/1/3/1/4/131453323/628671cf9744.pdf
    • http://files.fieldstonefarmllamas.com/uploads/1/3/0/8/130814032/7821639.pdf
    • https://cdn.shopify.com/s/files/1/0432/7243/7910/files/12515621608.pdf
    • https://cdn.shopify.com/s/files/1/0439/4146/2174/files/28685230414.pdf
    • https://cdn.shopify.com/s/files/1/0435/5214/5560/files/48762867375.pdf
    • https://cdn.shopify.com/s/files/1/0429/1143/2857/files/sebulemusup.pdf
    • https://cdn.shopify.com/s/files/1/0437/6972/5085/files/ifunbox_ios_9._0._2.pdf
    • https://cdn.shopify.com/s/files/1/0429/9925/1093/files/88309931402.pdf
    • https://cdn.shopify.com/s/files/1/0429/8863/4263/files/mevukolodazifureguseti.pdf
    • https://cdn.shopify.com/s/files/1/0435/9186/0383/files/zegiju.pdf
    • https://cdn.shopify.com/s/files/1/0437/8879/6065/files/simple_express_server.pdf
    • https://cdn.shopify.com/s/files/1/0435/5486/5320/files/historia_de_la_ortopedia_dental.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_off00007a63.bin
fe9ce5e27d21ff6209eb2e0c103eafeaee84fec5f9a5fdd79648871cd883b3a2
pdf-font-stream PDF embedded font (sfnt) at offset 0x7A63 5524 bytes
font_01_sfnt_off00008d1a.bin
58f157efa133087c127a5843370e7f34688b974abb9ceb9f2a441609186805af
pdf-font-stream PDF embedded font (sfnt) at offset 0x8D1A 10240 bytes