Malicious PDF — malware analysis report

Static analysis result for SHA-256 57b22efba86ee91e…

MALICIOUS

PDF

53.6 KB Created: 2020-08-19 04:57:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fddaa24b769293adbf8580cc3fa39404 SHA-1: 88f9db914ad0b4737412a3bd57961f7a9149254f SHA-256: 57b22efba86ee91efaf8febed1057f7b74f96fb1f4defe1efb0ea85cef063725
152 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier as malicious and contains a significant number of embedded links. One of these links, https://ttraff.com/pify?keyword=nc+coastal+pier+fishing+reports, points to known malicious redirector infrastructure. The document body, though heavily obfuscated, also contains this URL, suggesting it is the primary lure. The presence of a link farm indicates an attempt to distribute malicious content widely.

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=nc+coastal+pier+fishing+reports
    • http://files.secrettohappy.com/uploads/1/3/0/7/130739415/sakam.pdf
    • http://jegataga.carolinacounselingwellness.com/uploads/1/3/1/4/131453870/71fa135d22.pdf
    • http://nininoni.nunes-ueno.com/uploads/1/3/1/4/131407089/relijagigujeja-gubov-tirarubiriwuwo-jifir.pdf
    • http://gitej.maocorrea.com/uploads/1/3/0/8/130874284/kovebomimofiza-kutuwafefix-zixebekiva.pdf
    • https://cdn.shopify.com/s/files/1/0432/8800/2710/files/90520651437.pdf
    • https://cdn.shopify.com/s/files/1/0432/9812/8036/files/manaxuganopenu.pdf
    • https://cdn.shopify.com/s/files/1/0428/1014/6983/files/zubukovugosadisiliruda.pdf
    • https://cdn.shopify.com/s/files/1/0432/9511/3374/files/widinagivepokaxamime.pdf
    • https://cdn.shopify.com/s/files/1/0438/4024/1829/files/boost_converter_report.pdf
    • https://cdn.shopify.com/s/files/1/0429/3702/4668/files/ca_ipcc_amendments_for_may_2020.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nuvororixepexovi.pdf
    • https://cdn.shopify.com/s/files/1/0429/8866/7034/files/79196864616.pdf
    • https://cdn.shopify.com/s/files/1/0436/9865/1288/files/acid_base_and_salt_class_10_mcq.pdf
    • https://cdn.shopify.com/s/files/1/0433/6310/6968/files/64629651394.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_off0000941a.bin
04afe41651311b26b6652d2e5ab3cd11b175585628bd02fc74828eb664f995f1
pdf-font-stream PDF embedded font (sfnt) at offset 0x941A 5244 bytes
font_01_sfnt_off0000a5ea.bin
2ac1e797f4a98e15a1d3a2aba2c734a03130c088cb54b11cc3d39373abe40661
pdf-font-stream PDF embedded font (sfnt) at offset 0xA5EA 10376 bytes