Malicious PDF — malware analysis report

Static analysis result for SHA-256 475c832f5d8bbdb8…

MALICIOUS

PDF

51.3 KB Created: 2020-08-09 19:12:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 33a3d09d258178d1ceac00d503c447e4 SHA-1: 9cbe8b15a8dc4978680dd6294bc2662af35e7439 SHA-256: 475c832f5d8bbdb8cb427908e6b2e9a45d0f35bf94ac406136275979b5daf02b
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, which is further supported by the presence of numerous other embedded links. The document body, though heavily obfuscated, contains text that appears to be a lure for educational materials, directing users to the malicious URL. The primary malicious IOC is the redirector URL, which likely leads to a phishing page or malware download.

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=ncert+math+book+for+class+10+with+solution+pdf
    • http://files.saxonshouseofsoul.com/uploads/1/3/0/8/130874250/sifur.pdf
    • http://files.jacksonproofreadingservices.com/uploads/1/3/0/8/130814258/xerafojunevexit.pdf
    • http://files.letourdespice.com/uploads/1/3/0/7/130739631/8693160.pdf
    • https://cdn.shopify.com/s/files/1/0430/4764/9429/files/jurnal_anemia_gravis.pdf
    • https://cdn.shopify.com/s/files/1/0433/2794/6904/files/17238909339.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/64831632673.pdf
    • https://cdn.shopify.com/s/files/1/0428/9485/2252/files/43369157677.pdf
    • https://cdn.shopify.com/s/files/1/0427/9785/8972/files/69390396354.pdf
    • https://cdn.shopify.com/s/files/1/0430/8058/1274/files/22104658815.pdf
    • https://cdn.shopify.com/s/files/1/0429/8804/4447/files/5th_grade_math_problems.pdf
    • https://cdn.shopify.com/s/files/1/0432/8603/6635/files/38992990788.pdf
    • https://cdn.shopify.com/s/files/1/0437/2204/7637/files/ave_maria_gounod_soprano.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nexunalazuzifoginiwaboliz.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mozesuseb.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_off0000886b.bin
d7eb63326799d4c0cad73b865bd83f997f2151c5fc130c4960184661a000a649
pdf-font-stream PDF embedded font (sfnt) at offset 0x886B 5852 bytes
font_01_sfnt_off00009c41.bin
54ffadfaf267dfa036617540212272319bc93a43191818b1ee6c9f972181a9c0
pdf-font-stream PDF embedded font (sfnt) at offset 0x9C41 10624 bytes