Malicious PDF — malware analysis report

Static analysis result for SHA-256 a07bb63edff36aab…

MALICIOUS

PDF

45.3 KB Created: 2020-09-01 01:38:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 24f7605ec4632f3670780291dfd3dbf7 SHA-1: 8f81a5c23c07640ee7e71a999ca77926c62449af SHA-256: a07bb63edff36aab24808a30f43639081b0bf2b547e0c6d6b0e1a11558cea4df
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 disguised as a 'nrega job card'. The document also features a large number of embedded links to various PDFs hosted on Shopify and static.usrfiles.com, suggesting a link farm or SEO poisoning tactic. The ML classifier strongly indicated maliciousness, and the presence of a malicious redirector URL is a high-confidence indicator of malicious intent.

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/wix?keyword=nrega+job+card
    • https://cdn.shopify.com/s/files/1/0461/9829/2643/files/manifesto_of_futurism.pdf
    • https://cdn.shopify.com/s/files/1/0438/1310/9917/files/82747367496.pdf
    • https://cdn.shopify.com/s/files/1/0433/7349/4430/files/playboy_april_2002.pdf
    • https://cdn.shopify.com/s/files/1/0433/8388/1893/files/kareba.pdf
    • https://cdn.shopify.com/s/files/1/0434/2733/2252/files/40736753587.pdf
    • https://cdn.shopify.com/s/files/1/0431/4490/4855/files/84942832642.pdf
    • https://static.usrfiles.com/ugd/65b209_b21a026ab0de48f9b7cfa61c55142777.pdf
    • https://static.usrfiles.com/ugd/432b07_4740c021bc2345a984655911cc542a3b.pdf
    • https://static.usrfiles.com/ugd/b8c837_0226d84ba992452ea84e4f27fbe050bb.pdf
    • https://static.usrfiles.com/ugd/d94ae5_8971a696a15045ad877aa9b35d6c55a0.pdf
    • https://static.usrfiles.com/ugd/43d598_dea6057ad23a426683ab0b2c73719d19.pdf
    • https://static.usrfiles.com/ugd/3ab5ed_41a28fc592de453dadda4ff11145ae1c.pdf
    • https://static.usrfiles.com/ugd/cbe7f7_3de87cecd74f4b65853b424fb9c4d779.pdf
    • https://static.usrfiles.com/ugd/b8c837_1a3ecd10e2ae41c4a38f2cb00ddd1fec.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_off00006360.bin
c411da6af3eabaec743af9ffc62a9bc36fb0276d42b1ee334068538d2bb53648
pdf-font-stream PDF embedded font (sfnt) at offset 0x6360 5080 bytes
font_01_sfnt_off000074bc.bin
e30e98883f8535072d1352bef248284c06edc434e5bc5a33c3f6b5b78c91bcc5
pdf-font-stream PDF embedded font (sfnt) at offset 0x74BC 9928 bytes
font_02_sfnt_off000096d0.bin
cbd82f742b4ef9b8477e025282629e467cafbf72d74a7148bae4a299b3f61f84
pdf-font-stream PDF embedded font (sfnt) at offset 0x96D0 4636 bytes