Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3450ab567661e91…

MALICIOUS

PDF

47.2 KB Created: 2020-08-05 02:47:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 294be24751acea167c3f2bdbf4b6ce26 SHA-1: 28399a99041a71815737264644873fbe0887ac11 SHA-256: d3450ab567661e918dd66ebe024d0bfc52d673ebd95456adfa211a6e007558a7
154 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with a primary URL pointing to a known malicious redirector. The document body, though heavily obfuscated, contains the same redirector URL and appears to be a lure for a 'PDF to Word converter'. The ML classifier strongly indicated maliciousness. The primary attack vector is likely social engineering via a malicious link embedded within the PDF.

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=pdf+to+word+converter+online+without+email+free
    • http://files.levania.net/uploads/1/3/0/7/130775009/jarow.pdf
    • http://files.safebabyhappymommy.com/uploads/1/3/0/9/130969061/d1cb2b0.pdf
    • http://files.twistedpantry.com/uploads/1/3/1/4/131437242/8b56b86be93.pdf
    • http://files.fresnomarriagecounselor.com/uploads/1/3/1/3/131380397/16827.pdf
    • http://files.orangecountyflamenco.com/uploads/1/3/2/6/132695832/kedugesonagumoz_warulemidu_zixigexumo_xakexazefinipo.pdf
    • https://cdn.shopify.com/s/files/1/0431/2875/0241/files/48878241622.pdf
    • https://cdn.shopify.com/s/files/1/0431/3831/8487/files/28409248379.pdf
    • https://cdn.shopify.com/s/files/1/0432/7515/7670/files/37853639907.pdf
    • https://cdn.shopify.com/s/files/1/0428/8688/9625/files/pimuxupozikerunajoxejagir.pdf
    • https://cdn.shopify.com/s/files/1/0432/7279/8373/files/62731161751.pdf
    • https://cdn.shopify.com/s/files/1/0435/7767/1843/files/23282022000.pdf
    • https://cdn.shopify.com/s/files/1/0432/1984/5278/files/nevijabukej.pdf
    • https://cdn.shopify.com/s/files/1/0437/6847/9893/files/rasumolasovim.pdf
    • https://cdn.shopify.com/s/files/1/0434/3165/7638/files/kexegu.pdf
    • https://cdn.shopify.com/s/files/1/0432/0477/1999/files/91368059187.pdf
    • https://cdn.shopify.com/s/files/1/0430/6976/7842/files/60105283441.pdf
    • https://cdn.shopify.com/s/files/1/0435/3202/6008/files/59642979982.pdf
    • https://cdn.shopify.com/s/files/1/0432/7260/1756/files/bakapelodesalo.pdf
    • https://cdn.shopify.com/s/files/1/0430/0328/1571/files/types_of_non_governmental_organizations.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_off000079f7.bin
710c588853072d0b5d5764c4ba630911e173a0b9137df1ea3838bbb4c6b374e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79F7 5236 bytes
font_01_sfnt_off00008bb2.bin
8bbfec672024ff6f3ca60b3e870568b61996c7d47547e19b3f05dca919becaee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8BB2 10372 bytes

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