Malicious PDF — malware analysis report

Static analysis result for SHA-256 41fc34068edfbe12…

MALICIOUS

PDF

40.8 KB Created: 2020-08-12 09:30:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c8e48eeacc6d524e277cf26d8cdf18ac SHA-1: 0f33634f4f16dccea19b6c8cb5cc3aa27aa35b19 SHA-256: 41fc34068edfbe124b4b0b0266b7b5c9f7e5043e6881a171a481fa2864da1df3
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. Additionally, it exhibits a PDF SEO link farm behavior, embedding numerous external PDF links, many of which are hosted on Shopify. The ML classifier also strongly indicated maliciousness. The primary attack pattern appears to be SEO manipulation or a link farm designed to redirect users to potentially harmful content.

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/wb?keyword=homiletics%20and%20hermeneutics%20pdf
    • http://telubis.rachaelsurrell.com/uploads/1/3/2/6/132681464/maguxo_pudufiwabuf_todivurekakosix_lavise.pdf
    • http://fugeg.belluccisrl.com/uploads/1/3/1/3/131398455/nejujese_puxikumes_papisenej_puxujavebik.pdf
    • http://koromofa.ywcagc.org/uploads/1/3/0/7/130739885/3375883.pdf
    • http://files.carpetcleanoahu.com/uploads/1/3/2/6/132696274/22f9a5899.pdf
    • http://files.1860sciviliancelebration.com/uploads/1/3/2/6/132695620/bereximiwivatib-banusowej-tojux-xumom.pdf
    • https://cdn.shopify.com/s/files/1/0435/6662/9032/files/jazaxevubabexudep.pdf
    • https://cdn.shopify.com/s/files/1/0438/2402/1664/files/52032922993.pdf
    • https://cdn.shopify.com/s/files/1/0428/0372/4455/files/certificate_background.pdf
    • https://cdn.shopify.com/s/files/1/0430/6134/6466/files/terijojesipubugelaj.pdf
    • https://cdn.shopify.com/s/files/1/0430/6095/3249/files/pekibakubilupuwinaxifupig.pdf
    • https://cdn.shopify.com/s/files/1/0432/7990/9028/files/21711828892.pdf
    • https://cdn.shopify.com/s/files/1/0431/1393/9110/files/understanding_the_linux_kernel_4th_edition_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/6754/7552/files/catechism_of_catholic_church_malayalam.pdf
    • https://cdn.shopify.com/s/files/1/0437/8761/6413/files/bangsamoro_basic_law_latest_draft.pdf
    • https://cdn.shopify.com/s/files/1/0429/8578/3447/files/85443680956.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_off000062c3.bin
84ae3fd55639c17adc5450a616be3d8cdd2f03e4623fc45e540c3b51725e1c6f
pdf-font-stream PDF embedded font (sfnt) at offset 0x62C3 5356 bytes
font_01_sfnt_off000074c4.bin
1b7a3959b2369661a49560abf3295a87370fa9e5b3f8f310b5c1b5a5f3f8e4f7
pdf-font-stream PDF embedded font (sfnt) at offset 0x74C4 9972 bytes