Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c83b0c117d6b304…

MALICIOUS

PDF

41.9 KB Created: 2020-08-02 01:43:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: edeb08fe723219b7139acdd41302ce2f SHA-1: 258c67c414e7f335c1f7d55bd123731ea92332bf SHA-256: 7c83b0c117d6b304566d07002953d2206e7568d41dbb643c22d4817ea2a6a095
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains text suggesting it is a "spin selling pdf" and includes the malicious URL. The presence of many external PDF links suggests a link farm or SEO poisoning attempt to distribute 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=spin+selling+pdf
    • http://files.sfmwgc.org/uploads/1/3/0/9/130970016/ninavumadipa.pdf
    • http://files.conquestgamesite.com/uploads/1/3/1/4/131453453/4804539.pdf
    • http://files.wowscience.net/uploads/1/3/0/7/130776795/1410906.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/75555741983.pdf
    • https://cdn.shopify.com/s/files/1/0431/4877/1488/files/minecraft_youtube_banner.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/wotedosepano.pdf
    • https://cdn.shopify.com/s/files/1/0430/5692/2777/files/29752610976.pdf
    • https://cdn.shopify.com/s/files/1/0433/0553/3604/files/dasebanaselajixi.pdf
    • https://cdn.shopify.com/s/files/1/0432/4796/0232/files/44778519408.pdf
    • https://cdn.shopify.com/s/files/1/0435/1311/8872/files/52827515419.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/65621046881.pdf
    • https://cdn.shopify.com/s/files/1/0430/7052/1495/files/75063831518.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/23342697578.pdf
    • https://cdn.shopify.com/s/files/1/0427/9291/1007/files/muxabanetu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tikifulodu.pdf
    • https://cdn.shopify.com/s/files/1/0434/0809/7436/files/kakiviben.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_off00006480.bin
c169c94ad114e35d4d8cfbef3a15a407f91d705cc63cf3e1b6b052d94cbcec5c
pdf-font-stream PDF embedded font (sfnt) at offset 0x6480 5008 bytes
font_01_sfnt_off000075a3.bin
d7b35742417e7434efe9dbf39a8e3b9bde010ea478a5d8f40f74a47f141b904b
pdf-font-stream PDF embedded font (sfnt) at offset 0x75A3 11132 bytes