Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb9c5104f86e0904…

MALICIOUS

PDF

45.8 KB Created: 2020-08-01 06:52:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 240a6acb9084e8e4eb173673992c3250 SHA-1: 75967b29d19246bbaa5b0473793e0c191daaaf05 SHA-256: fb9c5104f86e0904fbc4d2975a0ff4b7cd2e8eaf36dc14d9f37633acb136eefd
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.com, which is designed to lure users into clicking on further malicious links. The document body, though heavily obfuscated, contains the URL and a keyword suggesting a lure related to an Xbox 360 issue. The presence of a large number of external PDF links, many hosted on Shopify, indicates a link farm used for SEO poisoning or to obscure the final destination. The ML classifier 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.com/pify?keyword=xbox+360+tray+wont+open
    • http://files.derekleebarton.com/uploads/1/3/0/9/130969896/gobapib.pdf
    • http://files.savepleasantonneighborhoods.com/uploads/1/3/0/9/130969434/jawuwataxalizob.pdf
    • http://files.pikespenplace.com/uploads/1/3/2/6/132680808/gijatu-dasogab-jaxebomiroluwe.pdf
    • http://files.allstarskaraoke.com/uploads/1/3/0/9/130969748/7215338.pdf
    • https://cdn.shopify.com/s/files/1/0434/0164/2149/files/kusemodut.pdf
    • https://cdn.shopify.com/s/files/1/0432/6001/8852/files/funepuradesamup.pdf
    • https://cdn.shopify.com/s/files/1/0434/3375/4785/files/72782546416.pdf
    • https://cdn.shopify.com/s/files/1/0434/7245/3797/files/45627655382.pdf
    • https://cdn.shopify.com/s/files/1/0429/6241/9863/files/pinging_a_discord_server.pdf
    • https://cdn.shopify.com/s/files/1/0428/2620/3302/files/88379512705.pdf
    • https://cdn.shopify.com/s/files/1/0428/5834/8703/files/49458310335.pdf
    • https://cdn.shopify.com/s/files/1/0434/5639/7464/files/rajuronorabebasugojeseg.pdf
    • https://cdn.shopify.com/s/files/1/0433/8686/3783/files/woranoketewo.pdf
    • https://cdn.shopify.com/s/files/1/0440/8547/7541/files/44551895222.pdf
    • https://cdn.shopify.com/s/files/1/0434/4568/2328/files/kitetibulad.pdf
    • https://cdn.shopify.com/s/files/1/0432/9911/1070/files/75769674236.pdf
    • https://cdn.shopify.com/s/files/1/0433/7473/9607/files/47948692822.pdf
    • https://cdn.shopify.com/s/files/1/0437/6412/1752/files/vofilasibufisexodutanad.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006896.bin
655253be544cf9b32c22ceb64d925b1ef69c3bd224c482ed7e4b52c63c792308		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6896 5180 bytes
font_01_sfnt_off00007a37.bin
b0086966d858f2a41a6ef9d05bd57e184e383d9a9e6e813a3c0ce968f4841cd4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A37 9852 bytes
font_02_sfnt_off00009bcf.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9BCF 4324 bytes

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