Malicious PDF — malware analysis report

Static analysis result for SHA-256 acf594f7f16e841d…

MALICIOUS

PDF

37.6 KB Created: 2020-08-02 11:23:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 28f060305958bdeafee36fb3640604b7 SHA-1: 3e73ef3b7d92aa8ca9a949682e6ee4ed1bdaac33 SHA-256: acf594f7f16e841d610377448ef685a66292ecfcfb65bc467b74118244162d5a
154 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which, 'https://ttraff.com/pify?keyword=intex+2500+gph+pump+manual', is flagged as a malicious redirector. The document body, though heavily obfuscated, contains text related to an 'Intex 2500 gph pump manual', suggesting a lure to trick users into clicking the malicious link. The presence of numerous external PDF links, many hosted on Shopify, indicates a link farm strategy. The ML classifier strongly flagged this PDF as malicious.

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.com/pify?keyword=intex+2500+gph+pump+manual
    • http://files.atousaraissyan.com/uploads/1/3/1/0/131069968/namilamivi-jemopavamudob-fegunafati.pdf
    • http://files.thisdesperatecity.com/uploads/1/3/1/3/131384171/kajemasogoter.pdf
    • http://files.professionals.global/uploads/1/3/1/0/131070938/1201168.pdf
    • https://cdn.shopify.com/s/files/1/0437/2021/2635/files/27062505332.pdf
    • https://cdn.shopify.com/s/files/1/0434/2392/4376/files/10260336201.pdf
    • https://cdn.shopify.com/s/files/1/0433/6877/5841/files/xipaz.pdf
    • https://cdn.shopify.com/s/files/1/0437/8243/9063/files/create_a_text_file_called_helloworld._md.pdf
    • https://cdn.shopify.com/s/files/1/0433/4475/6901/files/pidovogufurerewoto.pdf
    • https://cdn.shopify.com/s/files/1/0437/9190/9025/files/mugot.pdf
    • https://cdn.shopify.com/s/files/1/0437/1523/1895/files/dubuzakinuzavamaxi.pdf
    • https://cdn.shopify.com/s/files/1/0429/3620/5479/files/resize_file.pdf
    • https://cdn.shopify.com/s/files/1/0430/6560/6301/files/pals_pretest_answers.pdf
    • https://cdn.shopify.com/s/files/1/0427/7328/2983/files/pigixomalujenubakijejidun.pdf
    • https://cdn.shopify.com/s/files/1/0431/0017/6544/files/23851141090.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_off00005295.bin
b2f6d9332a26e9db2836bac0e29fc7b195066cf63c3ddbca1a0de7676b0a2f38
pdf-font-stream PDF embedded font (sfnt) at offset 0x5295 5364 bytes
font_01_sfnt_off000064b9.bin
06753ba2ba4839454df0ea63ef66f3235d9ad72556866e306513c5c753bdb223
pdf-font-stream PDF embedded font (sfnt) at offset 0x64B9 10468 bytes