Malicious PDF — malware analysis report

Static analysis result for SHA-256 1490ebf03b135796…

MALICIOUS

PDF

34.4 KB Created: 2020-08-14 17:04:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cb3ea90853e160f6ece4fde02b0ab06f SHA-1: 6c158b75b6ca3833bd52bc4d8442ec9328223121 SHA-256: 1490ebf03b135796e4be2c2b480065d9dd14edd808191b6e495f00d7dd80ad0b
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 it as a link farm pointing to malicious redirector infrastructure. The document body, though partially obfuscated, contains text related to a crossword clue and includes the primary malicious URL. The ML classifier strongly indicates maliciousness, and the presence of many external links suggests an attempt to drive traffic to potentially harmful sites.

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=answer+to+113+across+geography+crossword+clue
    • http://bipipef.bgmassociates.net/uploads/1/3/1/3/131383483/purovatiperidar.pdf
    • http://vitobefap.wow4metrodetroit.org/uploads/1/3/2/3/132303338/448007.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/0000/3749/files/access_bars_livre.pdf
    • https://cdn.shopify.com/s/files/1/0431/2668/5858/files/35747649460.pdf
    • https://cdn.shopify.com/s/files/1/0431/1423/4016/files/zanuleburamuxelajojame.pdf
    • https://cdn.shopify.com/s/files/1/0437/0713/8201/files/financial_accounting_basics_in_telugu.pdf
    • https://cdn.shopify.com/s/files/1/0432/5244/9435/files/vapupukidokazoliribile.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/zupapinited.pdf
    • https://cdn.shopify.com/s/files/1/0434/6170/5888/files/17815264454.pdf
    • https://cdn.shopify.com/s/files/1/0429/4865/7318/files/wovugijev.pdf
    • https://cdn.shopify.com/s/files/1/0430/4394/6649/files/gavavoviguzifuvep.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zodotuxufaliga.pdf
    • https://cdn.shopify.com/s/files/1/0431/8858/4605/files/3370537941.pdf
    • https://cdn.shopify.com/s/files/1/0430/3863/8241/files/49062268198.pdf
    • https://cdn.shopify.com/s/files/1/0430/8267/8433/files/21328327999.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_off00004780.bin
e61e9c876f0f9bdab56ff22e6298f8f433f96339286ac52ff7bddf7b0bc6ecbc
pdf-font-stream PDF embedded font (sfnt) at offset 0x4780 5732 bytes
font_01_sfnt_off00005b11.bin
b774dc0749d5ad058a47942d9157b2c30034db70d57faffa76c77e483ef159b4
pdf-font-stream PDF embedded font (sfnt) at offset 0x5B11 9820 bytes