Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa5c68f3713cc7fc…

MALICIOUS

PDF

47.8 KB Created: 2020-08-06 14:42:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: deb706fd596abccf3011956732da6695 SHA-1: 6f0b20bdf387f9a5982bf1fd7539a4704a6407a2 SHA-256: aa5c68f3713cc7fc7dd4dbed5890b840878a6e90c9f8370651e67af06b1d0db8
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify domains hosting other PDFs, which is indicative of a link farm designed to manipulate search engine results or distribute content. One critical heuristic identified a link to a known malicious redirector infrastructure at `https://ttraff.cc/pify?keyword=antenna+and+wave+propagation+tutorial+pdf`. The document body text, though partially corrupted, includes the same URL, suggesting the primary intent is to redirect users to malicious 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.cc/pify?keyword=antenna+and+wave+propagation+tutorial+pdf
    • http://files.culinaryabstraction.com/uploads/1/3/1/4/131407668/37b415ba301f430.pdf
    • http://files.freshrescue.com/uploads/1/3/1/3/131398357/2325814.pdf
    • http://files.mondokdentalimplantsmexico.com/uploads/1/3/0/7/130738710/numexelapezawomokovu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/bukidesokat.pdf
    • https://cdn.shopify.com/s/files/1/0434/1596/1762/files/jatadiso.pdf
    • https://cdn.shopify.com/s/files/1/0432/0083/9842/files/think_race_and_ethnicity.pdf
    • https://cdn.shopify.com/s/files/1/0432/0637/7633/files/conjunctive_adverbs_list_and_examples.pdf
    • https://cdn.shopify.com/s/files/1/0429/1536/5031/files/xurozojapekidorokubabas.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/pexigubozorabavajodumixi.pdf
    • https://cdn.shopify.com/s/files/1/0431/6761/3087/files/67154489504.pdf
    • https://cdn.shopify.com/s/files/1/0433/8050/6791/files/gelimigexasu.pdf
    • https://cdn.shopify.com/s/files/1/0437/3531/8689/files/kizovepebirelawerebas.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_off00007eab.bin
fde6b35af1bd06ae1199671a15ae66a2c6eaa286357dbec04fbb3b280f157469
pdf-font-stream PDF embedded font (sfnt) at offset 0x7EAB 5172 bytes
font_01_sfnt_off00009072.bin
e8f8a10e0be8fb6f860305015a6d62c3263d7d0bbb7d9fec8f5bf585e37e64bd
pdf-font-stream PDF embedded font (sfnt) at offset 0x9072 10048 bytes