Malicious PDF — malware analysis report

Static analysis result for SHA-256 a98c4337f0fd0f87…

MALICIOUS

PDF

51.2 KB Created: 2020-08-19 01:09:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e32b3993e70a7d83205c1d8cde50c9c6 SHA-1: c2869788aee51c4f0116613d6c0fe20e74790d06 SHA-256: a98c4337f0fd0f87536240b808b97ef7f179d2e6043d59b55af034d126f83bee
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a link that redirects to a malicious URL, masquerading as a software installer. The PDF_MALICIOUS_REDIRECTOR_LINK heuristic and the embedded URL in the document body strongly indicate a phishing or redirection attempt. The ML_NYX_PDF_MALICIOUS score further supports the malicious nature of the file. The document body text, though partially corrupted, contains the lure 'Creative cloud apps offline installer' and the malicious URL.

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=creative+cloud+apps+offline+installer
    • http://fiwavaze.picacookie.com/uploads/1/3/1/4/131483281/fofoz.pdf
    • http://files.branfordeducationhalloffame.com/uploads/1/3/2/7/132740533/d447c385909f85b.pdf
    • https://cdn.shopify.com/s/files/1/0427/6515/6508/files/guxanasonozo.pdf
    • https://cdn.shopify.com/s/files/1/0441/3505/5512/files/takadidulob.pdf
    • https://cdn.shopify.com/s/files/1/0434/5475/9065/files/vizolowa.pdf
    • https://cdn.shopify.com/s/files/1/0427/5427/7532/files/the_world_s_end_123movies.pdf
    • https://cdn.shopify.com/s/files/1/0435/0004/4454/files/hotspot_shield_with_crack.pdf
    • https://cdn.shopify.com/s/files/1/0433/2794/6904/files/pafanefavuzexezobuvita.pdf
    • https://cdn.shopify.com/s/files/1/0437/1932/7896/files/rizixerefexaribi.pdf
    • https://cdn.shopify.com/s/files/1/0429/2981/5705/files/actual_reading_test_ielts.pdf
    • https://cdn.shopify.com/s/files/1/0438/1304/4386/files/gufaguri.pdf
    • https://cdn.shopify.com/s/files/1/0429/3191/2857/files/laraxa.pdf
    • https://cdn.shopify.com/s/files/1/0430/2598/9785/files/fulton_county_jail_mugshots_2016.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/noviwuvado.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_off0000895d.bin
4233daa8afb95e1ed2d49e1bd8f4969db6741236a63b47a9aa9289e2114d20c3
pdf-font-stream PDF embedded font (sfnt) at offset 0x895D 5116 bytes
font_01_sfnt_off00009ad4.bin
57f30a9eae89bb0f5dc071213059a2c9c2c36bbf4e98c558727d2522a45fc347
pdf-font-stream PDF embedded font (sfnt) at offset 0x9AD4 10752 bytes