Malicious PDF — malware analysis report

Static analysis result for SHA-256 161b03c212bb476a…

MALICIOUS

PDF

39.9 KB Created: 2020-08-17 16:13:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 29950d5dd8589c4bda2a03103046ed97 SHA-1: 3f0bc38964686f5c2f266bd029e6238b702bdd51 SHA-256: 161b03c212bb476a6949c3f65b844c238cfb43b070fd98468600d14b5e0bf668
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a significant number of embedded URLs, many pointing to Shopify, suggesting a link farm for SEO manipulation or to host further malicious content. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.ru/pify?keyword=lspdfr+crash+callouts'. The ML classifier also strongly indicated maliciousness. No scripts were extracted, limiting the analysis of direct execution behavior.

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.ru/pify?keyword=lspdfr+crash+callouts
    • http://files.karilagandancesociety.org/uploads/1/3/2/7/132712057/3463889.pdf
    • http://xiwirizub.antiqueautomobilia.com/uploads/1/3/1/8/131857419/mepavafonuf-xulakovo.pdf
    • http://fagadanug.kwameopoku.com/uploads/1/3/1/6/131606289/wosuj.pdf
    • http://files.techniquejobs.com/uploads/1/3/1/4/131406816/2390231.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/5837/1496/files/silokudabem.pdf
    • https://cdn.shopify.com/s/files/1/0433/8348/8679/files/kidim.pdf
    • https://cdn.shopify.com/s/files/1/0430/9437/6605/files/zezekuzeruzogufizip.pdf
    • https://cdn.shopify.com/s/files/1/0428/4760/0796/files/datagerosilezufupapok.pdf
    • https://cdn.shopify.com/s/files/1/0434/6878/3782/files/19389441921.pdf
    • https://cdn.shopify.com/s/files/1/0430/2965/9797/files/sufon.pdf
    • https://cdn.shopify.com/s/files/1/0434/0659/0104/files/95261243730.pdf
    • https://cdn.shopify.com/s/files/1/0432/5782/3390/files/all_unearthed_arcana.pdf
    • https://cdn.shopify.com/s/files/1/0427/5834/0774/files/wutegijenolifuvigifipunad.pdf
    • https://cdn.shopify.com/s/files/1/0437/9885/5837/files/firunuriwesotolunan.pdf
    • https://cdn.shopify.com/s/files/1/0433/1870/6331/files/80118387754.pdf
    • https://cdn.shopify.com/s/files/1/0434/5374/3270/files/42029881695.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_off00005dd8.bin
426a561690b7b7633fe9161a4c5a53b47888f9cf2ae52f7f4a633d3ca47dba49
pdf-font-stream PDF embedded font (sfnt) at offset 0x5DD8 5184 bytes
font_01_sfnt_off00006f73.bin
f3062a13fdfe32b700fb0882324cb22eb23bcf34e2cfa79a821335d82fcde194
pdf-font-stream PDF embedded font (sfnt) at offset 0x6F73 10448 bytes