Malicious PDF — malware analysis report

Static analysis result for SHA-256 d27a7faa35fec8be…

MALICIOUS

PDF

41.3 KB Created: 2020-09-04 16:52:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d3914cd307d4dd948e98d44a34e83726 SHA-1: 616b223657ebc318e8d1b31a6165d246fdf1bbc5 SHA-256: d27a7faa35fec8be29e85b394c6cdd8a1ba9137372b73e89a22ae6597240d63e
152 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK, indicating it redirects to malicious infrastructure. The document body, though heavily obfuscated, contains a URL that is also present in the heuristics and IOCs. The PDF also contains a large number of external links, flagged by PDF_SEO_LINK_FARM, suggesting a link farm for SEO poisoning or traffic generation, ultimately leading to the malicious redirector.

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=latitude+and+longitude+worksheet+3rd+grade
    • https://static.usrfiles.com/ugd/0cd3a8_81019b6da997456ca6a17dacc93d5250.pdf
    • https://static.usrfiles.com/ugd/01e791_0bfe43dab7054d428cfcd9e107c3f0ec.pdf
    • https://static.usrfiles.com/ugd/ea78e0_527e1f64e1384a799222905ff6df563b.pdf
    • https://static.usrfiles.com/ugd/9e53d4_f3bbb0461e914b6eb959bd495edf36fd.pdf
    • https://cdn.shopify.com/s/files/1/0429/6769/5509/files/17128839195.pdf
    • https://cdn.shopify.com/s/files/1/0436/8472/4889/files/xulepepaxikanemoxemedixak.pdf
    • https://static.usrfiles.com/ugd/d9e9a0_1a49c1daf5474090b3b5970fcda58e85.pdf
    • https://static.usrfiles.com/ugd/b6aaa0_b33ae0f8b9744bc78176f29b26dc76e2.pdf
    • https://static.usrfiles.com/ugd/d01287_905f02caeb6a4c42960b10be46bcabad.pdf
    • https://static.usrfiles.com/ugd/bc4951_7f6f5d498e0f4b68b869ff0a180e3527.pdf
    • https://cdn.shopify.com/s/files/1/0433/7346/1669/files/boot_camp_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0434/6911/1461/files/poulan_chainsaw_repair.pdf
    • https://cdn.shopify.com/s/files/1/0432/3042/9346/files/bejeweled_twist_game.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_off00006384.bin
d79b6d6a1d88c63c22405810fb1e51753bd2e3ecd4aa23ce23564fe45043ca45
pdf-font-stream PDF embedded font (sfnt) at offset 0x6384 5348 bytes
font_01_sfnt_off000075c9.bin
fad37fff0f1e2fdeb5f13bf3e746f841c0ee9862c962f9d5193031f615608fd4
pdf-font-stream PDF embedded font (sfnt) at offset 0x75C9 10172 bytes