Malicious PDF — malware analysis report

Static analysis result for SHA-256 79f248fda96cd0df…

MALICIOUS

PDF

44.5 KB Created: 2020-07-28 20:40:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a3d5d8692de0027c2e98e779990cf890 SHA-1: c60a9a894c95ae148815c6df84ce0d7aac7953fa SHA-256: 79f248fda96cd0df131bc083996c73c82b62cb1661a83a4e53f49fb38aca9c1f
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one specifically pointing to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. The document body appears to be obfuscated or corrupted, preventing a clear understanding of its intended lure, but the presence of numerous external links suggests an attempt to drive traffic to malicious sites.

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=kalender+2018+pdf+a4
    • http://files.myswimvillage.com/uploads/1/3/1/1/131164205/8091349.pdf
    • http://files.yoursosweetamericandi.co.uk/uploads/1/3/2/6/132681307/9924891.pdf
    • http://files.lcsupperclub.com/uploads/1/3/1/4/131406736/1643772.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/0981/0327/files/tiliseru.pdf
    • https://cdn.shopify.com/s/files/1/0439/6387/5486/files/49720969973.pdf
    • https://cdn.shopify.com/s/files/1/0428/9203/4211/files/mavunivujimowurozed.pdf
    • https://cdn.shopify.com/s/files/1/0430/4217/7181/files/35768203171.pdf
    • https://cdn.shopify.com/s/files/1/0433/5471/8358/files/kapona.pdf
    • https://cdn.shopify.com/s/files/1/0428/4655/2230/files/22110500931.pdf
    • https://cdn.shopify.com/s/files/1/0432/5765/9547/files/gixus.pdf
    • https://cdn.shopify.com/s/files/1/0431/7046/3912/files/zevab.pdf
    • https://cdn.shopify.com/s/files/1/0429/3502/5831/files/21251671445.pdf
    • https://cdn.shopify.com/s/files/1/0429/5294/9913/files/zefilawijarisetavefe.pdf
    • https://cdn.shopify.com/s/files/1/0434/7317/4680/files/80712042396.pdf
    • https://cdn.shopify.com/s/files/1/0433/3839/9912/files/22809245226.pdf
    • https://cdn.shopify.com/s/files/1/0439/5106/3195/files/xavonaduduxuzobixiroz.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_off00006f14.bin
227dbe0ea2879c46065bd7b7b8c75602d887318e1c812a73583770819da833fb
pdf-font-stream PDF embedded font (sfnt) at offset 0x6F14 4984 bytes
font_01_sfnt_off00008012.bin
0393eaf2fff0949eba425d8e67904394418317dcee0b64e7822a122b2f11dfe8
pdf-font-stream PDF embedded font (sfnt) at offset 0x8012 11004 bytes