Malicious PDF — malware analysis report

Static analysis result for SHA-256 14ec648c50785c40…

MALICIOUS

PDF

41.5 KB Created: 2020-08-13 01:50:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1782d2808601b64d8bdd7b5c3cb7c0ee SHA-1: 1564b0a26e4b080d42913cbcdc0a5af8c5374357 SHA-256: 14ec648c50785c4070ba0844fa447524c68ef971f76d93d34222e0dc470ddfb6
154 Risk Score

Malware Insights

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

The PDF contains numerous links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text related to a calendar and the malicious URL. The presence of multiple external PDF links suggests a link farm or redirection tactic to distribute malicious content.

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.ru/pify?keyword=chinese+new+year+2020+calendar+pdf
    • http://futab.delrayalternatorandstarter.com/uploads/1/3/0/7/130776612/58225e3.pdf
    • http://files.104brilliant.com/uploads/1/3/0/7/130776661/4684a085feeb8.pdf
    • http://files.kisyoga.com/uploads/1/3/0/7/130739835/luxolim.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0447/8477/9430/files/zinosaxefizuwuzami.pdf
    • https://cdn.shopify.com/s/files/1/0431/0515/7284/files/angularjs_interview_questions_and_answers_for_experienced.pdf
    • https://cdn.shopify.com/s/files/1/0428/4514/3206/files/hari_arora_applied_mathematics_3_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/9467339244.pdf
    • https://cdn.shopify.com/s/files/1/0430/6134/6466/files/8191830812.pdf
    • https://cdn.shopify.com/s/files/1/0435/9441/6290/files/acuerdo_de_paz_con_las_farc.pdf
    • https://cdn.shopify.com/s/files/1/0435/2029/5064/files/xujisim.pdf
    • https://cdn.shopify.com/s/files/1/0434/2733/2252/files/20072803770.pdf
    • https://cdn.shopify.com/s/files/1/0440/1355/1781/files/blessed_assurance_chords_g.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gefoviliruvowej.pdf
    • https://cdn.shopify.com/s/files/1/0435/8206/2753/files/tewefopewitazegunozogipe.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_off000062d7.bin
5da44180c96a15d20362ba5af9d19db4c2a050e32eb437df7fa2661782549d83
pdf-font-stream PDF embedded font (sfnt) at offset 0x62D7 5616 bytes
font_01_sfnt_off000075f2.bin
6794526f342e6631c8f2e1ed310476cdcd06dc7d33aadc5db90a6b6c3241a29d
pdf-font-stream PDF embedded font (sfnt) at offset 0x75F2 10364 bytes