Malicious PDF — malware analysis report

Static analysis result for SHA-256 79ecfaf03b689270…

MALICIOUS

PDF

37.9 KB Created: 2020-08-22 07:43:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2243db6566f951c30eef98af91fb455c SHA-1: 7a89407522abd429b390a54826574bf814e9edd9 SHA-256: 79ecfaf03b6892707532b6e8b9c1ade2dba591e04815b6ae3bd69e68469300b0
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a redirector infrastructure known for malicious activity. The document body, though obfuscated, contains a URL that appears to be part of this link farm. The primary function of this document is to act as a link farm, directing users to potentially malicious websites.

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=khandeshi+song++sawan+mahina+ma
    • http://files.lindseymaeeventsanddesigns.com/uploads/1/3/2/6/132695663/d4748aab910.pdf
    • http://files.iwillriseandshine.com/uploads/1/3/1/4/131453588/vezanabe.pdf
    • http://files.downtoearth-solutions.com/uploads/1/3/1/1/131164520/23389c768e56.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://cdn.shopify.com/s/files/1/0434/4617/3852/files/28443197233.pdf
    • https://cdn.shopify.com/s/files/1/0431/0577/9863/files/puts_on_sunglasses_emoticon.pdf
    • https://cdn.shopify.com/s/files/1/0430/7910/6724/files/14575450295.pdf
    • https://cdn.shopify.com/s/files/1/0429/2955/3575/files/73688234216.pdf
    • https://cdn.shopify.com/s/files/1/0440/2036/7510/files/dark_souls_2_cheat_engine_table_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/6604/8164/files/4926602555.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/71299233386.pdf
    • https://cdn.shopify.com/s/files/1/0437/6651/3818/files/accountancy_project_for_class_11_cbse.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000044ba.bin
9fe5abe761600f8f1fa02c31bca4f5cd1dee54c9d367a88b9909934d8995b62d
pdf-font-stream PDF embedded font (sfnt) at offset 0x44BA 5172 bytes
font_01_sfnt_off00005642.bin
12ada584097fdda57a394a7f0961cc7f2e7f5a2885582c7218c8319cbca5a846
pdf-font-stream PDF embedded font (sfnt) at offset 0x5642 12824 bytes
font_02_sfnt_off00007ee3.bin
43dcf05397540185e86d7bb2f4da11915216bb7669b94714968c934da3945a86
pdf-font-stream PDF embedded font (sfnt) at offset 0x7EE3 3048 bytes