Malicious PDF — malware analysis report

Static analysis result for SHA-256 18a6f3143d4956ec…

MALICIOUS

PDF

36.2 KB Created: 2020-08-07 05:44:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ca8efd4319384b8f8d8d093b3836ad5f SHA-1: 6b3353424fd9daff2198490fef1772131cb1a22f SHA-256: 18a6f3143d4956ec97b246285f3157fa86848b061b09a18e5af8824c290fe47d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, with a critical heuristic identifying a link to known malicious redirector infrastructure at 'https://ttraff.com/pify?keyword=de+cero+a+uno+libro+pdf'. The ML classifier also strongly indicated maliciousness. This suggests the document's primary purpose is to redirect users to potentially harmful websites, likely for phishing or malware delivery.

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=de+cero+a+uno+libro+pdf
    • http://files.artintheiron.com/uploads/1/3/1/4/131438557/sabokonex.pdf
    • http://files.zsofia-opraszabo.com/uploads/1/3/1/4/131407164/5417010.pdf
    • http://files.csungsf.org/uploads/1/3/0/7/130776487/769c4.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/2063/9646/files/tipeluzasipuvepeliv.pdf
    • https://cdn.shopify.com/s/files/1/0430/7795/9833/files/84975471011.pdf
    • https://cdn.shopify.com/s/files/1/0428/0755/8310/files/vamizeroki.pdf
    • https://cdn.shopify.com/s/files/1/0432/7663/2214/files/bugafetugoja.pdf
    • https://cdn.shopify.com/s/files/1/0431/6214/0840/files/77818918800.pdf
    • https://cdn.shopify.com/s/files/1/0428/2161/5772/files/dajug.pdf
    • https://cdn.shopify.com/s/files/1/0431/4100/5480/files/67033183714.pdf
    • https://cdn.shopify.com/s/files/1/0431/0364/9954/files/66247341782.pdf
    • https://cdn.shopify.com/s/files/1/0432/6624/4766/files/42290635177.pdf
    • https://cdn.shopify.com/s/files/1/0431/2186/8960/files/17573339009.pdf
    • https://cdn.shopify.com/s/files/1/0441/3577/6408/files/snow_white_and_the_seven_dwarfs_brothers_grimm.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004ea0.bin
85aacd86a186513e059a3bdf226f8fbd53923468fd266309560c4f44319bfa3e
pdf-font-stream PDF embedded font (sfnt) at offset 0x4EA0 5112 bytes
font_01_sfnt_off0000600e.bin
c86d1cb967c78a25473ee2a06df592ab89b6e6a746073dcb922a77c00fc6ae29
pdf-font-stream PDF embedded font (sfnt) at offset 0x600E 11180 bytes