Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c72f88ff8fc0da8…

MALICIOUS

PDF

43.2 KB Created: 2020-09-06 15:52:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9a2345c6d655e3cd085e8eec7fec1fa8 SHA-1: 9cc51ebb62826575813617f0ed7146afd8301fd5 SHA-256: 6c72f88ff8fc0da8589c10bdb087f760fb8ef334a1307faded084420281b2d2b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous embedded URLs, including a critical redirector link to 'ttraff.link'. This suggests the document's primary purpose is to direct users to malicious websites, likely for phishing or to download further malware. The ML classifier also strongly indicated maliciousness.

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.link/wix?keyword=cisco+861+router+configuration+guide
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/9730/0885/files/safafi.pdf
    • https://cdn.shopify.com/s/files/1/0433/9017/3349/files/93417972407.pdf
    • https://cdn.shopify.com/s/files/1/0433/5622/5694/files/tususudomajoxopaw.pdf
    • https://cdn.shopify.com/s/files/1/0429/3473/0911/files/screen_capture_on_samsung_android_phone.pdf
    • https://cdn.shopify.com/s/files/1/0435/3631/8616/files/zirixokakuvodutitaz.pdf
    • https://cdn.shopify.com/s/files/1/0435/8393/0527/files/application_of_derivatives_word_problems_with_solutions.pdf
    • https://cdn.shopify.com/s/files/1/0429/6874/4099/files/16140257064.pdf
    • https://cdn.shopify.com/s/files/1/0437/4485/4165/files/rojizadewivewikarit.pdf
    • https://cdn.shopify.com/s/files/1/0430/1488/1433/files/arnica_montana_6ch_bula.pdf
    • https://cdn.shopify.com/s/files/1/0438/2585/6672/files/revenue_management_in_hotel_industry.pdf
    • https://cdn.shopify.com/s/files/1/0437/1028/3931/files/biochemistry_mcq.pdf
    • https://cdn.shopify.com/s/files/1/0472/3179/5365/files/ancient_egyptian_social_classes_lesson_plans.pdf
    • https://cdn.shopify.com/s/files/1/0432/1348/8292/files/jekon.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_off00006090.bin
0a5236bd1efa11e79980f3f437e97f50bc97666fd24fa4690625bcd50d142425
pdf-font-stream PDF embedded font (sfnt) at offset 0x6090 5460 bytes
font_01_sfnt_off00007337.bin
5757aab9590ccadc3f3c9d5db3f8086b4fd13d87b5c56b8026502b49d87ee9ce
pdf-font-stream PDF embedded font (sfnt) at offset 0x7337 14060 bytes