Malicious PDF — malware analysis report

Static analysis result for SHA-256 202b9b7da61f2b6e…

MALICIOUS

PDF

43.3 KB Created: 2020-08-09 11:01:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 29f2eb314d175feea745f0aed69a566c SHA-1: a4e69b52f2acf31816113b000e1a65dd0e69f51a SHA-256: 202b9b7da61f2b6e8b177f7087735043e30b6cc63d5048ea887b0ed41fdd1f56
154 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with one prominent link leading to a malicious redirector. The document body, though heavily obfuscated, contains text that appears to be a lure for a 'broadcom bcm2711 datasheet pdf'. The ML classifier strongly flagged this PDF as malicious. The primary IOC is the redirector URL, which is designed to lead 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=broadcom+bcm2711+datasheet+pdf
    • http://files.puremichiganminiaussies.com/uploads/1/3/0/7/130775017/60766bb2d831.pdf
    • http://files.edwardkosinski.com/uploads/1/3/1/4/131407005/55206f2a6e.pdf
    • http://jebobom.akirafukui.com/uploads/1/3/1/4/131408738/wakesav-kodowopilabis-bajowelujeme-wubepomudu.pdf
    • https://cdn.shop
    • https://cdn.shopify.com/s/files/1/0433/2004/9822/files/durujapefijedetoxodila.pdf
    • https://cdn.shopify.com/s/files/1/0431/7986/8324/files/sebenamekafuvijixinev.pdf
    • https://cdn.shopify.com/s/files/1/0427/7298/8071/files/sujasodaravijabanip.pdf
    • https://cdn.shopify.com/s/files/1/0429/4000/6559/files/96498232443.pdf
    • https://cdn.shopify.com/s/files/1/0430/4293/0842/files/voxenanatajavalep.pdf
    • https://cdn.shopify.com/s/files/1/0433/8424/2337/files/91519691065.pdf
    • https://cdn.shopify.com/s/files/1/0430/0757/4179/files/10630407878.pdf
    • https://cdn.shopify.com/s/files/1/0438/2107/2546/files/binomische_formel_erklrung.pdf
    • https://cdn.shopify.com/s/files/1/0430/2657/9610/files/41588437586.pdf
    • https://cdn.shopify.com/s/files/1/0431/3785/9735/files/apoptosis_and_cell_death.pdf
    • https://cdn.shopify.com/s/files/1/0430/1671/6437/files/zowodajaniwiveri.pdf
    • https://cdn.shopify.com/s/files/1/0432/6273/8592/files/a_guide_to_mysql_pratt.pdf
    • https://cdn.shopify.com/s/files/1/0432/5595/5613/files/sogifumojifik.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_off00006874.bin
b3bbd3b17a0177c3a06adc1470fd2099aca548d0c46a37f16dca653bda56036e
pdf-font-stream PDF embedded font (sfnt) at offset 0x6874 5816 bytes
font_01_sfnt_off00007c23.bin
6817a187a38d871f047ce30d20b55e676d5daa69cc1ff4153c33c9ebb8b5fb17
pdf-font-stream PDF embedded font (sfnt) at offset 0x7C23 10636 bytes