Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfc042057c13d6ec…

MALICIOUS

PDF

65.8 KB Created: 2020-08-14 06:54:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e12205d1395cbf5847a0f2e5541bb342 SHA-1: 290666ba7967cdf09e34203481eccab044e63193 SHA-256: dfc042057c13d6ecf0983eb5558a7334e671a92390fcfb05f496e5a22b0ec87e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.cc'. The document body, though heavily obfuscated, contains the string 'Usps direct mail template' and the malicious URL, suggesting a lure. The presence of numerous external PDF links, many hosted on Shopify, indicates a link farm designed to obscure the ultimate destination and potentially spread malicious content. The ML classifier also 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.cc/pify?keyword=usps+direct+mail+template
    • http://files.patronus-security.com/uploads/1/3/1/6/131606789/xetagiwizasopasin.pdf
    • http://tidev.sparklingimagedesigns.com/uploads/1/3/1/4/131437296/4693198.pdf
    • http://files.easyindonesian.com/uploads/1/3/0/7/130738622/8225274.pdf
    • https://cdn.shopify.com/s/files/1/0437/2335/8358/files/35046784568.pdf
    • https://cdn.shopify.com/s/files/1/0437/6523/5866/files/php_password_protect_pages.pdf
    • https://cdn.shopify.com/s/files/1/0438/4066/7808/files/saints_row_4_nexus.pdf
    • https://cdn.shopify.com/s/files/1/0435/5457/0399/files/wevinaxagubukegixakoza.pdf
    • https://cdn.shopify.com/s/files/1/0432/0722/9597/files/bijarunerixoxigexe.pdf
    • https://cdn.shopify.com/s/files/1/0433/4911/5029/files/30220750064.pdf
    • https://cdn.shopify.com/s/files/1/0438/6154/1014/files/definition_of_talent_management.pdf
    • https://cdn.shopify.com/s/files/1/0448/4520/3618/files/carbozinc_859.pdf
    • https://cdn.shopify.com/s/files/1/0432/2741/4696/files/fumusokilevibesujivu.pdf
    • https://cdn.shopify.com/s/files/1/0434/0059/3557/files/el_calvinismo.pdf
    • https://cdn.shopify.com/s/files/1/0427/9150/1990/files/kofuf.pdf
    • https://cdn.shopify.com/s/files/1/0431/2832/4257/files/xefilutulitujun.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a590.bin
1026d73119fd041ba643059be5fc79591c79c57a2dab14c909801bf57e76c043		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA590 5212 bytes
font_01_sfnt_off0000b723.bin
74c23c0f939b076d9d446dc693c42f12b7620c99a5343661a2b43af8758084f5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB723 1804 bytes
font_02_sfnt_off0000c004.bin
fabc1004e6152b15bca91971e0e3405b4181fa44ecda2ec820ab4f4e539e12cc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC004 11156 bytes
font_03_sfnt_off0000e4be.bin
1b4b27cd429d9800ce6de6bc8be2d1c6382da676ed598ddfeffce0e3d1a2ff1c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE4BE 16100 bytes

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