Malicious PDF — malware analysis report

Static analysis result for SHA-256 0dacdcb2a83d4b32…

MALICIOUS

PDF

51.0 KB Created: 2020-09-18 18:06:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dfb21fcafda9fb14b473389dd803c0ba SHA-1: 2141d97d98cd844e4d446f160f3121131f3a7a21 SHA-256: 0dacdcb2a83d4b3209cb58d19d4b1ff5458ba3fbb5b838a7f14dc1dd6e71746e
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.club/wix?keyword=shen+hao+tfc+617-a'. Additionally, the PDF exhibits characteristics of a link farm, with numerous embedded URLs. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the presence of a malicious redirector URL is sufficient to indicate a likely phishing or malware distribution attempt.

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.club/wix?keyword=shen+hao+tfc+617-a
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0464/3238/7224/files/hair_stylist_resume_summary.pdf
    • https://cdn.shopify.com/s/files/1/0432/3383/7224/files/beneteau_first_36._7_manual.pdf
    • https://cdn.shopify.com/s/files/1/0437/8243/9063/files/bottomsheet_with_recyclerview_android.pdf
    • https://cdn.shopify.com/s/files/1/0430/4306/1913/files/87871018538.pdf
    • https://cdn.shopify.com/s/files/1/0432/0185/5646/files/nalubori.pdf
    • https://cdn.shopify.com/s/files/1/0432/8102/3140/files/karma_dog_training.pdf
    • https://cdn.shopify.com/s/files/1/0430/4217/7181/files/28869203617.pdf
    • https://cdn.shopify.com/s/files/1/0434/2192/5525/files/nucleophilic_addition_reaction_of_carbonyl_compounds.pdf
    • https://cdn.shopify.com/s/files/1/0431/1416/8480/files/24875306593.pdf
    • https://cdn.shopify.com/s/files/1/0429/7595/3049/files/tuzavipakenu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0009/4112/files/al_anon_big_book.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_off00007cf3.bin
6094424a4053c2ad258d61e152f4c9b85b14ed17e75799af5ab53a0f13542ed5
pdf-font-stream PDF embedded font (sfnt) at offset 0x7CF3 4824 bytes
font_01_sfnt_off00008d5c.bin
e0588f57c4b5ecb06a1d12a38b983a461ab816da67a0edc680c7e1cf15f7a6cd
pdf-font-stream PDF embedded font (sfnt) at offset 0x8D5C 10412 bytes
font_02_sfnt_off0000b104.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e
pdf-font-stream PDF embedded font (sfnt) at offset 0xB104 4324 bytes