Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b3a163e18886877…

MALICIOUS

PDF

47.7 KB Created: 2020-08-15 13:48:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dfc9d6ed8ad8f762e510a537d384211c SHA-1: 896ea3aa82dd6fd1760f6f3ca4e50ea7726e13b6 SHA-256: 1b3a163e18886877bbc34003a26e4523ee41b73bdea373a6e0792e81bc484944
154 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with a critical heuristic firing for a malicious redirector. The embedded document body, though heavily obfuscated, contains the URL 'https://ttraff.cc/wb?keyword=education%20at%20a%20glance%202018%20pdf', which is flagged as malicious. This suggests the document's primary purpose is to redirect users to malicious infrastructure, likely for phishing or malware distribution.

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.cc/wb?keyword=education%20at%20a%20glance%202018%20pdf
    • http://files.foreverhorsecrazy.com/uploads/1/3/0/8/130813818/wedikeveb_xekebarigos_melujirudojo_rinew.pdf
    • http://files.olympiaindivisible.com/uploads/1/3/0/7/130776206/2296091.pdf
    • https://cdn.shopify.com/s/files/1/0432/8125/2512/files/vocabulary_accounting_and_finance.pdf
    • https://cdn.shopify.com/s/files/1/0435/1007/1460/files/87888020223.pdf
    • https://cdn.shopify.com/s/files/1/0437/1569/0650/files/liraxesimuxidimamiba.pdf
    • https://cdn.shopify.com/s/files/1/0430/7222/5442/files/48380215456.pdf
    • https://cdn.shopify.com/s/files/1/0449/8512/2984/files/canarios_classical_guitar.pdf
    • https://cdn.shopify.com/s/files/1/0431/9238/5700/files/jarotaminamavito.pdf
    • https://cdn.shopify.com/s/files/1/0433/3407/4523/files/mibizokutanivufalodabuli.pdf
    • https://cdn.shopify.com/s/files/1/0434/6891/4838/files/27637037228.pdf
    • https://cdn.shopify.com/s/files/1/0432/0120/0289/files/6246872902.pdf
    • https://cdn.shopify.com/s/files/1/0435/4883/6004/files/ne_yo_addicted.pdf
    • https://cdn.shopify.com/s/files/1/0431/0397/7634/files/remove_duplicates_from_linked_list_python.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_off00007abf.bin
2ac745d3e72d770a47fea240455b751bd0b397b6023dbb689e75a1a45cde9312
pdf-font-stream PDF embedded font (sfnt) at offset 0x7ABF 5524 bytes
font_01_sfnt_off00008da3.bin
ddb85de57882c3d998642e08215dfd387c6dadc65c918bcfdec84a7cddf73799
pdf-font-stream PDF embedded font (sfnt) at offset 0x8DA3 10716 bytes