Malicious PDF — malware analysis report

Static analysis result for SHA-256 81c93a0e320359f2…

MALICIOUS

PDF

45.2 KB Created: 2020-08-02 05:45:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 611a4d589105fe777f69eff36545c48b SHA-1: 388c7d0ffcbc48f987c826eb02e58a6bc1c72e9d SHA-256: 81c93a0e320359f2e17de8b9cd5010edc50ad3082a690acabca77d507a191c6f
120 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious due to a critical heuristic firing for a malicious redirector link. It also contains a large link farm pointing to various external PDFs, many hosted on Shopify. The primary malicious URL identified is https://ttraff.cc/pify?keyword=python+flatten+array, which likely serves as a redirector to a malicious payload or phishing page. The document body contains garbled text and metadata, but the presence of numerous external links is the main indicator of malicious intent.

Heuristics 3

  • 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.
  • 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=python+flatten+array
    • http://files.skar-productions.com/uploads/1/3/0/9/130969399/tiwix.pdf
    • http://files.jtidentures.com/uploads/1/3/1/4/131438843/kedaxexu-degosuwa-duzazomofiw-nokabapivube.pdf
    • http://files.keelestudenthouses.com/uploads/1/3/0/9/130969310/7934872.pdf
    • http://files.coastalsilviculturecommittee.com/uploads/1/3/1/3/131380641/62d0f180.pdf
    • http://files.meganmmoore.com/uploads/1/3/2/7/132740187/wumetu.pdf
    • https://cdn.shopify.com/s/files/1/0437/1575/6181/files/nsfw_subreddits_411.pdf
    • https://cdn.shopify.com/s/files/1/0428/2161/5775/files/vufolufa.pdf
    • https://cdn.shopify.com/s/files/1/0430/3906/4225/files/dipixupekivonivizazed.pdf
    • https://cdn.shopify.com/s/files/1/0436/4979/4213/files/nukori.pdf
    • https://cdn.shopify.com/s/files/1/0434/1107/9317/files/24409361505.pdf
    • https://cdn.shopify.com/s/files/1/0427/8370/3206/files/57146995934.pdf
    • https://cdn.shopify.com/s/files/1/0432/9239/3640/files/57105164473.pdf
    • https://cdn.shopify.com/s/files/1/0427/4146/5244/files/18125004430.pdf
    • https://cdn.shopify.com/s/files/1/0431/2760/3354/files/cher_lloyd_oath_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0434/9755/4084/files/vapobi.pdf
    • https://cdn.shopify.com/s/files/1/0440/5837/8392/files/54344734697.pdf
    • https://cdn.shopify.com/s/files/1/0431/6279/6186/files/81210935758.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/42820491308.pdf
    • https://cdn.shopify.com/s/files/1/0431/2960/2205/files/72646915813.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_off00006d2b.bin
0c0a3e0ea1e616c2378c07108e1047a44017f614cd5f0b0dd7adafe7b88434ca
pdf-font-stream PDF embedded font (sfnt) at offset 0x6D2B 4780 bytes
font_01_sfnt_off00007d6f.bin
15dc0ef908af7a9fc2b228777953b828a78f298be2cdc79679ccf5442c98599f
pdf-font-stream PDF embedded font (sfnt) at offset 0x7D6F 13696 bytes