Malicious PDF — malware analysis report

Static analysis result for SHA-256 effa3ba9677427f1…

MALICIOUS

PDF

45.4 KB Created: 2020-08-24 22:48:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eba8aede30fe3bfa9ea16b7bac17637e SHA-1: be57252530742b20f7fec8cc57f1dae42aad27e1 SHA-256: effa3ba9677427f107c31fd1455a0b4b487dedab036f0f344f95748345552a8f
154 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one critical heuristic identifying a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that matches the malicious redirector. The presence of a large number of external PDF links, many hosted on Shopify, suggests a link farm designed to lure users to click through to potentially 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.cc/pify?keyword=funniest+kid+test+answers+part+16
    • http://files.hillsidehensfarm.com/uploads/1/3/2/7/132710772/6587184.pdf
    • https://cdn.shopify.com/s/files/1/0432/8534/8510/files/15596064648.pdf
    • https://cdn.shopify.com/s/files/1/0429/0094/7103/files/the_master_swing_trader_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/0006/9285/files/sasulefemubitifozum.pdf
    • https://cdn.shopify.com/s/files/1/0429/0219/2287/files/90938028997.pdf
    • https://cdn.shopify.com/s/files/1/0428/5648/0935/files/bomarodir.pdf
    • https://cdn.shopify.com/s/files/1/0437/4550/9537/files/bizumi.pdf
    • https://cdn.shopify.com/s/files/1/0431/4752/6305/files/santa_dancing_booth.pdf
    • https://cdn.shopify.com/s/files/1/0429/9204/2137/files/wapup.pdf
    • https://cdn.shopify.com/s/files/1/0436/4835/2406/files/piguwubisotezovizekitetev.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005e3b.bin
2ec986644c78e78e02dec136f78b0369647f9ee986f77518060d5a2e3ccc9bb0
pdf-font-stream PDF embedded font (sfnt) at offset 0x5E3B 5008 bytes
font_01_sfnt_off00006f57.bin
d9f96797a54aa890ffc864a62d0ee1bea369dc139b9f5922dbee51669d5f236a
pdf-font-stream PDF embedded font (sfnt) at offset 0x6F57 1796 bytes
font_02_sfnt_off000077e3.bin
d1bb74d14fcedf9145a6680f8f3cb0861d392b77c8c613f33c95edc87ae014e6
pdf-font-stream PDF embedded font (sfnt) at offset 0x77E3 10060 bytes
font_03_sfnt_off00009a4a.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c
pdf-font-stream PDF embedded font (sfnt) at offset 0x9A4A 4324 bytes