Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ecc817af7dd0cc4…

MALICIOUS

PDF

54.4 KB Created: 2020-08-07 02:46:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 088123b5beb483cfc3a18e9fdcaba42b SHA-1: 27d99ce5fc8d1654ef087fb9875afe7648bcfb84 SHA-256: 1ecc817af7dd0cc467a82249a127c530efbe5c4575b3ea3edcd0573b4640b85c
152 Risk Score

Malware Insights

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

The PDF contains embedded links that point to a redirector URL, which is a common technique for distributing malicious content. The ML classifier strongly indicated maliciousness. The document body itself contains garbled text but also includes the primary malicious URL and several other URLs hosted on Shopify, likely as part of a link farm to improve search engine ranking for the malicious content.

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=boundary+layer+theory+nptel+pdf
    • http://zeditefu.philadelphiaeritreanchurch.com/uploads/1/3/2/7/132741555/221b27c1f5.pdf
    • http://files.ballinloughgfc.ie/uploads/1/3/1/8/131856569/4284019.pdf
    • http://files.yogadown.ca/uploads/1/3/1/3/131383544/maruse.pdf
    • http://files.solanaenergy.com/uploads/1/3/1/6/131606072/a6872a12d.pdf
    • http://files.theflourishsisterhood.com/uploads/1/3/1/3/131398156/95d18288fa830.pdf
    • https://cdn.shopify.com/s/files/1/0430/5177/8202/files/60682860066.pdf
    • https://cdn.shopify.com/s/files/1/0430/7556/7777/files/werupejivalomegaxikasev.pdf
    • https://cdn.shopify.com/s/files/1/0429/3545/1804/files/41964860055.pdf
    • https://cdn.shopify.com/s/files/1/0438/8565/8280/files/40333125289.pdf
    • https://cdn.shopify.com/s/files/1/0430/0318/3258/files/lunesuxowoxeka.pdf
    • https://cdn.shopify.com/s/files/1/0429/9603/9839/files/46486747328.pdf
    • https://cdn.shopify.com/s/files/1/0431/0581/2629/files/6756962510.pdf
    • https://cdn.shopify.com/s/files/1/0429/6019/1637/files/nibizinogamoderalojojaman.pdf
    • https://cdn.shopify.com/s/files/1/0438/4518/9794/files/podira.pdf
    • https://cdn.shopify.com/s/files/1/0433/0127/3750/files/osrs_gertrude_s_cat.pdf
    • https://cdn.shopify.com/s/files/1/0432/0333/0209/files/safesuvibadonod.pdf
    • https://cdn.shopify.com/s/files/1/0438/9961/7448/files/gopikumevoroxevuwut.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_off00007291.bin
f29f190d69f0e25a8a55e22ccdf39e642c4d53aeb4170824a06b05c94e168afa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7291 5708 bytes
font_01_sfnt_off0000834d.bin
2b7e106f80d688c078b93bdea6ad6f49dcd5095898bbe94c3b44a147d1694b78		 pdf-font-stream PDF embedded font (sfnt) at offset 0x834D 4936 bytes
font_02_sfnt_off00009417.bin
57c4d717db144e9ac7b7f7556df65bf9f9e7f5d400a5cbcc807c6fa3ad889f0b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9417 13168 bytes
font_03_sfnt_off0000bdf3.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBDF3 4324 bytes

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