Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea828c845f9a7e8f…

MALICIOUS

PDF

45.3 KB Created: 2020-08-31 14:35:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 274bcf057e5e2ff915c56d7961854c00 SHA-1: de88c96d33e46516a92970b14bfa819bb1804b64 SHA-256: ea828c845f9a7e8f9dac592ff38b5fd69b27ca206bfe70e62cffba1819a8c158
154 Risk Score

Malware Insights

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

The PDF document contains numerous embedded links, with a critical heuristic firing indicating a malicious redirector. The document body, though partially corrupted, contains text related to 'reporting descriptive statistics' and includes the malicious URL. This suggests a social engineering lure to redirect users to malicious content. The ML classifier also strongly indicated maliciousness.

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=how+to+report+descriptive+statistics
    • https://cdn.shopify.com/s/files/1/0435/0273/1430/files/rifasotodiwewevu.pdf
    • https://cdn.shopify.com/s/files/1/0434/2035/2677/files/accessory_nerve_anatomy.pdf
    • https://cdn.shopify.com/s/files/1/0440/8298/7158/files/penelib.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xakuxosisubesabemobaf.pdf
    • https://cdn.shopify.com/s/files/1/0470/8735/4014/files/rorimuxipajonutusuw.pdf
    • https://static.usrfiles.com/ugd/de02f3_78d5fd065ae54fc4a5bcb49a40c3b393.pdf
    • https://static.usrfiles.com/ugd/b8c837_7916537059cc45f88ceacf1d70a4e61d.pdf
    • https://static.usrfiles.com/ugd/a2c2bc_5731f4b2cd5344ef99386321570eed90.pdf
    • https://static.usrfiles.com/ugd/b8c837_c156cb0b3be843ce97a3e570bb728c2c.pdf
    • https://cdn.shopify.com/s/files/1/0429/8443/9971/files/65866638873.pdf
    • https://cdn.shopify.com/s/files/1/0434/5197/3799/files/bexeguwelitiganuxanibe.pdf
    • https://cdn.shopify.com/s/files/1/0432/6909/5590/files/ascii_code.pdf
    • https://cdn.shopify.com/s/files/1/0431/6869/4432/files/21266136001.pdf
    • https://cdn.shopify.com/s/files/1/0430/3110/1603/files/27241480301.pdf
    • https://cdn.shopify.com/s/files/1/0427/5604/7004/files/pefodikabinuzegusixej.pdf
    • https://cdn.shopify.com/s/files/1/0430/9850/5383/files/82564068317.pdf
    • https://cdn.shopify.com/s/files/1/0430/7940/1632/files/59927984965.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_off00007158.bin
24b906930f04ec5f9bd8689876bfaf746898c7f28e98983b30c7b5f56ca2ce67
pdf-font-stream PDF embedded font (sfnt) at offset 0x7158 5148 bytes
font_01_sfnt_off000082ff.bin
a3175250dbfaf59cbe72aa2b65cf03bc4f697dd178f517d334ed9ca87d4e6e50
pdf-font-stream PDF embedded font (sfnt) at offset 0x82FF 10840 bytes