Malicious PDF — malware analysis report

Static analysis result for SHA-256 2027cfe0c8dea05f…

MALICIOUS

PDF

34.6 KB Created: 2020-08-11 07:29:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0bdcaf3272a067ac94d206c5c94e311c SHA-1: 20bfa50af1e85dd60ac07e698b895c441d5956b0 SHA-256: 2027cfe0c8dea05f071959e81fbdff65d6893327e535e2310d9f2e318a832ca1
152 Risk Score

Malware Insights

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

The PDF contains a link farm designed to redirect users to malicious infrastructure, specifically identified by the critical heuristic PDF_MALICIOUS_REDIRECTOR_LINK. The primary malicious URL is https://ttraff.com/pify?keyword=ars+poetica+pdf+download, which is presented as a document download. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the document body and heuristics confirm a social engineering lure.

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=ars+poetica+pdf+download
    • http://files.meganhuylo.com/uploads/1/3/1/8/131871433/046ded0e.pdf
    • http://files.photosbyalexelerian.com/uploads/1/3/1/3/131383358/tudiluwori.pdf
    • http://files.rosannavanmierlo.com/uploads/1/3/0/7/130775126/zebemekaxud-dobezerejarosop-nexumejosar.pdf
    • https://cdn.shopify.com/s/files/1/0437/0972/6888/files/69560779277.pdf
    • https://cdn.shopify.com/s/files/1/0429/8217/8979/files/mawuv.pdf
    • https://cdn.shopify.com/s/files/1/0433/8765/0211/files/pugozadulute.pdf
    • https://cdn.shopify.com/s/files/1/0431/6656/4507/files/wetokutakigibiwavuzi.pdf
    • https://cdn.shopify.com/s/files/1/0430/1019/5605/files/69175758983.pdf
    • https://cdn.shopify.com/s/files/1/0437/2935/4906/files/12_major_scales_alto_sax.pdf
    • https://cdn.shopify.com/s/files/1/0432/3724/5086/files/29116735089.pdf
    • https://cdn.shopify.com/s/files/1/0437/6743/1329/files/edible_plants_of_the_pacific_northwest.pdf
    • https://cdn.shopify.com/s/files/1/0430/3113/4365/files/42777610638.pdf
    • https://cdn.shopify.com/s/files/1/0433/5032/7451/files/manesuduni.pdf
    • https://cdn.shopify.com/s/files/1/0429/5272/0543/files/bupezunuvagirufop.pdf
    • https://cdn.shopify.com/s/files/1/0431/7950/7880/files/pixopi.pdf
    • https://cdn.shopify.com/s/files/1/0435/3196/0469/files/42065861878.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_off0000487a.bin
9e257e4ea09b9df9a13ed457f8494bf76ba5cec3b01d9807bdf44513bfeffa21
pdf-font-stream PDF embedded font (sfnt) at offset 0x487A 5228 bytes
font_01_sfnt_off00005a62.bin
22a98e78c68abcd573f670f6852a346ea46a95c5556a476d7ea24b9d9e4f7b84
pdf-font-stream PDF embedded font (sfnt) at offset 0x5A62 10752 bytes