Malicious PDF — malware analysis report

Static analysis result for SHA-256 571c176c15389952…

MALICIOUS

PDF

40.6 KB Created: 2020-08-06 23:07:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 14523ff79427a05c5e171d510cd2f117 SHA-1: c772c1c228af23b4729aa5703852f15339d9266f SHA-256: 571c176c1538995288c8ce3ef8d31613de38916de27a71abf749cea122e72580
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.cc/pify?keyword=ielts+reading+2020+pdf'. This URL is embedded within the document body, disguised as a legitimate IELTS reading PDF. The presence of a large number of external PDF links, many hosted on Shopify, suggests a link farm designed to improve search engine ranking for malicious content. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the primary attack vector appears to be social engineering via a deceptive link.

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=ielts+reading+2020+pdf
    • http://files.bridgeyoungadults.com/uploads/1/3/1/3/131381464/fetinodemoxizubuturo.pdf
    • http://files.davidlloyd1.com/uploads/1/3/1/3/131383747/1522783.pdf
    • http://mulatixud.lakewashingtonsaddleclub.org/uploads/1/3/1/8/131872225/2028706.pdf
    • http://files.lousivillequeensdaughters.com/uploads/1/3/1/4/131406202/6979019.pdf
    • http://files.boldwooddesign.com/uploads/1/3/2/7/132740764/7342566.pdf
    • https://cdn.shopify.com/s/files/1/0439/5106/3195/files/kugenolabigiwiselefebupik.pdf
    • https://cdn.shopify.com/s/files/1/0434/3323/0488/files/40504850949.pdf
    • https://cdn.shopify.com/s/files/1/0432/0601/7185/files/co_worker_synonym.pdf
    • https://cdn.shopify.com/s/files/1/0432/8236/6629/files/kawugijigusore.pdf
    • https://cdn.shopify.com/s/files/1/0432/8862/5316/files/sapegupozoma.pdf
    • https://cdn.shopify.com/s/files/1/0427/9438/5575/files/interior_design_reference_manual.pdf
    • https://cdn.shopify.com/s/files/1/0427/9923/5228/files/96235765932.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/kafojisiguzisov.pdf
    • https://cdn.shopify.com/s/files/1/0432/7777/9100/files/frozen_let_it_go_lyrics_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/0571/4338/files/ielts_speaking_topics_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xovigaza.pdf
    • https://cdn.shopify.com/s/files/1/0431/2249/1541/files/50_cent_21_questions_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0433/7133/1734/files/zakinotavebiduwodizavosap.pdf
    • https://cdn.shopify.com/s/files/1/0435/2812/6618/files/78204919216.pdf
    • https://cdn.shopify.com/s/files/1/0430/7006/2754/files/dusajelasodezigobufo.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_off000061ec.bin
d92f4e7c146637f8fc9bf7bb2a6c36702ba39a2b3e94d6932582fd777e247b2b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61EC 5420 bytes
font_01_sfnt_off00007463.bin
5c843a87bd47706eb0b5f853fd730758499054f3693768c69c588d33cc8ce68d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7463 9636 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.