Malicious PDF — malware analysis report

Static analysis result for SHA-256 728797dd4fe3374e…

MALICIOUS

PDF

49.4 KB Created: 2020-07-29 07:29:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 69fcdc76b0bed0a75b85881c8dbcf851 SHA-1: e375d150db3900053463c87ce490db07a58b69db SHA-256: 728797dd4fe3374e6c527f83adb1271cbec7a6a431a7d63e3458af0d5a20e8dd
154 Risk Score

Malware Insights

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

The PDF contains a high number of embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. While no scripts were extracted, the PDF structure and embedded links suggest an attempt to lure users to malicious sites, likely for phishing or further payload delivery.

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=mama+ek+peg+la+song+free
    • http://files.knit-a-square-southafrica.com/uploads/1/3/1/3/131379268/587716.pdf
    • http://files.suicidepreventionuw.org/uploads/1/3/1/4/131407353/b48946230624.pdf
    • http://files.bariatricketo.com/uploads/1/3/2/7/132741211/pamojuzoberinel.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://cdn.shopify.com/s/files/1/0437/1100/4821/files/votiteso.pdf
    • https://cdn.shopify.com/s/files/1/0433/2643/9582/files/fixososotofuxuzisamunar.pdf
    • https://cdn.shopify.com/s/files/1/0430/8038/4674/files/76200408640.pdf
    • https://cdn.shopify.com/s/files/1/0428/8937/9996/files/45883157213.pdf
    • https://cdn.shopify.com/s/files/1/0431/6564/7012/files/warulawojapawekukojo.pdf
    • https://cdn.shopify.com/s/files/1/0432/0506/6913/files/99996860045.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/5903401900.pdf
    • https://cdn.shopify.com/s/files/1/0435/1148/0472/files/59371036774.pdf
    • https://cdn.shopify.com/s/files/1/0432/2312/2084/files/gixidemujaka.pdf
    • https://cdn.shopify.com/s/files/1/0428/3655/7987/files/34649437932.pdf
    • https://cdn.shopify.com/s/files/1/0441/1362/5240/files/linirof.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_off00006e06.bin
0eb77da35d3f232e6c852840901164083c1236e2ac212c17578b617b1b2a4710
pdf-font-stream PDF embedded font (sfnt) at offset 0x6E06 4948 bytes
font_01_sfnt_off00007ec2.bin
36368e01dab69d3511779f1ec8b8991215b18834b226712ec44f9096599f6b26
pdf-font-stream PDF embedded font (sfnt) at offset 0x7EC2 3244 bytes
font_02_sfnt_off00008b7d.bin
305decbc4ad8ded041e6eb97da61e73d2583562695dcdc615537acd7fd887670
pdf-font-stream PDF embedded font (sfnt) at offset 0x8B7D 14452 bytes