Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4a4f48bdb8321ef…

MALICIOUS

PDF

35.6 KB Created: 2020-08-22 19:11:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cd0435614701d87db1c8bb3d11f7a2fc SHA-1: 144562b34d576410c27fb9828a6ab99aaad803ef SHA-256: a4a4f48bdb8321efa9378977f18c0b44ddd7fbeff3942c834de8960866579bd9
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a large number of embedded links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector at `https://ttraff.cc/pify?keyword=bicycle+thieves%2528+2013+full+movie`. This suggests a link farm or phishing campaign disguised as a movie download. The ML classifier also strongly indicated maliciousness.

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=bicycle+thieves%2528+2013+full+movie
    • http://wegiki.cdmontessori.com/uploads/1/3/1/4/131438641/5048185.pdf
    • http://files.maskmartin.com/uploads/1/3/0/7/130739590/gobajewu-pogodupos-doredupa.pdf
    • https://cdn.shopify.com/s/files/1/0432/2990/5058/files/besokakogerifaxesiveni.pdf
    • https://cdn.shopify.com/s/files/1/0432/8567/6188/files/adobe_reader_xi_convert_to_word_free.pdf
    • https://cdn.shopify.com/s/files/1/0449/2935/1835/files/bartleby_the_scrivener_summary.pdf
    • https://cdn.shopify.com/s/files/1/0436/3865/3081/files/rurasawovipumujelo.pdf
    • https://cdn.shopify.com/s/files/1/0431/6302/5567/files/dedosuwozituxidub.pdf
    • https://cdn.shopify.com/s/files/1/0431/7279/0427/files/motigejuveje.pdf
    • https://cdn.shopify.com/s/files/1/0429/4279/1839/files/nagig.pdf
    • https://cdn.shopify.com/s/files/1/0431/4189/0209/files/kusal.pdf
    • https://cdn.shopify.com/s/files/1/0429/4311/9516/files/aula_internacional_1_cuaderno_de_ejercicios.pdf
    • https://cdn.shopify.com/s/files/1/0440/3894/6981/files/rigapisinoxilureposim.pdf
    • https://cdn.shopify.com/s/files/1/0435/2940/4567/files/tuxizedemasatasikokawow.pdf
    • https://cdn.shopify.com/s/files/1/0436/2623/4009/files/90906218584.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_off00004c79.bin
09164651a3fe3c81f6264402f45f9318106858c480a1bc0407ca35c164a72e3d
pdf-font-stream PDF embedded font (sfnt) at offset 0x4C79 5592 bytes
font_01_sfnt_off00005f85.bin
0bcdb7d460d3a02d59f3f922bedde882cf8a3a6eb758c51e9de6ca332848e87a
pdf-font-stream PDF embedded font (sfnt) at offset 0x5F85 10076 bytes