Malicious PDF — malware analysis report

Static analysis result for SHA-256 e950cd7420ce964a…

MALICIOUS

PDF

33.1 KB Created: 2020-08-29 01:21:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f9dbed4eb075b82dfec449f4c0883906 SHA-1: d37fc85b6f3acb331a3ee345b6e9eaaa15be59aa SHA-256: e950cd7420ce964a80956bc5ee0316ef1805f78c85a823e998daef274bebb4ad
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.com, which is likely intended to lead the user to a phishing or malware distribution site. The document body, though heavily obfuscated, contains the URL and a title suggesting a lure. The ML classifier strongly indicates 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.com/wix?keyword=into+the+woods+study+guide
    • https://static.usrfiles.com/ugd/b8c837_a9c67ac738474dfdb6e0367572dc38c4.pdf
    • https://static.usrfiles.com/ugd/b8c837_8cf3b0b71b3d427f87cd7294520a3692.pdf
    • https://static.usrfiles.com/ugd/b8c837_1587aea5e0934618be9b5e73dd47a9df.pdf
    • https://cdn.shopify.com/s/files/1/0432/9986/4734/files/72947295411.pdf
    • https://cdn.shopify.com/s/files/1/0459/9562/2559/files/79309074827.pdf
    • https://cdn.shopify.com/s/files/1/0430/6577/0135/files/81759616193.pdf
    • https://cdn.shopify.com/s/files/1/0433/3718/7493/files/jean_ayres_sensory_integration_and_the_child.pdf
    • https://static.usrfiles.com/ugd/b8c837_52bb319913b542cbaa5eee536e66732a.pdf
    • https://static.usrfiles.com/ugd/b8c837_6a48830810ed4c32a71d3450ff964d25.pdf
    • https://static.usrfiles.com/ugd/b8c837_f1147572b55143cc93c1682e22796521.pdf
    • https://static.usrfiles.com/ugd/b8c837_dd4de72e93eb4c70991de63e2712227d.pdf
    • https://static.usrfiles.com/ugd/b8c837_c50ea909704e41b29383d42fd4759460.pdf
    • https://cdn.shopify.com/s/files/1/0439/4627/9080/files/2873871607.pdf
    • https://cdn.shopify.com/s/files/1/0431/2875/0241/files/sample_video_download.pdf
    • https://cdn.shopify.com/s/files/1/0435/2458/7679/files/cursive_letter_b_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0448/9094/7739/files/agudas_palabras.pdf
    • https://cdn.shopify.com/s/files/1/0429/9869/4042/files/possessive_pronouns_and_possessive_adjectives_exercises_with_answers.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_off000046e1.bin
397c21681f2ad0138161094a37a7363c12bdac3e7070ef4fc9748dac2533f653
pdf-font-stream PDF embedded font (sfnt) at offset 0x46E1 4880 bytes
font_01_sfnt_off00005790.bin
01f3d5ab474820bfee36fb5b0dc7837b3baaae906abd8ff1d05b5787b6e27254
pdf-font-stream PDF embedded font (sfnt) at offset 0x5790 9400 bytes