Malicious PDF — malware analysis report

Static analysis result for SHA-256 e78c2d019366ae84…

MALICIOUS

PDF

44.3 KB Created: 2020-09-18 04:16:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2518388c70a2d69cd0d36a344fb51704 SHA-1: 9a3570b12183febe46f2d0703fb9fb6aa4b8950b SHA-256: e78c2d019366ae84ca69b63c1eb03c88efc539ff0414a1ed6a12ba829d300a93
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a mass external link farm, with a critical heuristic firing for a malicious redirector link. The document body, though heavily obfuscated, contains text related to a 'functional resume worksheet' and includes the malicious URL. This suggests a phishing or social engineering attack aiming to redirect users to malicious content. No scripts were extracted from this sample.

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.link/wix?keyword=functional+resume+worksheet
    • https://d3ce6b27-d13a-4419-bbd1-2c04d98b49b5.filesusr.com/ugd/221eaa_def77825d04944c3b6780ff08ccb7ad4.pdf?index=true
    • https://081494dc-68fb-4602-a1b7-6ad9e12df096.filesusr.com/ugd/078c79_5cc94ab50ee44724b8902135a2f05ba9.pdf?index=true
    • https://1bb83f81-a2f0-463a-a259-f5e95d273298.filesusr.com/ugd/270e53_87e02b1817a04fd78061e0212eeaa5b7.pdf?index=true
    • https://5c64502b-16c6-4afa-8f6c-202a7cb8328a.filesusr.com/ugd/3be3a7_b287f0e2e0fc4a9499b7bf6a39b4e3f7.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0432/3039/6574/files/sewatunezuj.pdf
    • https://cdn.shopify.com/s/files/1/0429/2247/5687/files/nixuriwidole.pdf
    • https://cdn.shopify.com/s/files/1/0440/3865/2069/files/dragon_references_in_the_bible.pdf
    • https://cdn.shopify.com/s/files/1/0428/7230/7875/files/zapowijikojijuxalalo.pdf
    • https://cdn.shopify.com/s/files/1/0427/6633/6167/files/xekosimixanovelipumi.pdf
    • https://cdn.shopify.com/s/files/1/0433/9548/1750/files/saxanujulaviwelapuwonisa.pdf
    • https://cdn.shopify.com/s/files/1/0430/6377/1293/files/coco_remember_me_piano_sheet_music_free.pdf
    • https://cdn.shopify.com/s/files/1/0431/0145/4500/files/free_barron_s_gre_book.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_off00006f6e.bin
bfe139545893ff1e905b2fe33195a99e07c6514a91e4455101a4d12efd7e600d
pdf-font-stream PDF embedded font (sfnt) at offset 0x6F6E 5148 bytes
font_01_sfnt_off000080d8.bin
b096c5cadafe65a6b79d27f32efdc98328ac9d580adce2921cf61de7149d65e4
pdf-font-stream PDF embedded font (sfnt) at offset 0x80D8 10520 bytes