Malicious PDF — malware analysis report

Static analysis result for SHA-256 33decbd7ebfd94da…

MALICIOUS

PDF

51.0 KB Created: 2020-08-18 20:01:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f763faa622bb4267c91efef2bfd8a114 SHA-1: 472496332839c02f63a6280aeafab0c9d65a8070 SHA-256: 33decbd7ebfd94da0f54254251725710ff60cd758f0cb1f2bd48bbadaece1e92
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.ru, which is likely part of an SEO poisoning campaign. The document body, though heavily obfuscated, contains text related to 'metal cutting and forming notes pdf' and references wkhtmltopdf, suggesting a lure to attract users searching for technical documents. The presence of numerous external PDF links further supports the SEO poisoning tactic. No scripts were extracted, limiting the analysis of direct payload delivery.

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=metal+cutting+and+forming+notes+pdf
    • http://janatenil.ancientcitycustoms.com/uploads/1/3/0/8/130874493/xutogowumo.pdf
    • http://files.cityheritage.net/uploads/1/3/1/6/131607110/wumozuledawiso-fofudiwemas-medadel-bosezipofosi.pdf
    • https://cdn.shopify.com/s/files/1/0435/5060/5461/files/8915577882.pdf
    • https://cdn.shopify.com/s/files/1/0433/2473/5643/files/kabuxajumexo.pdf
    • https://cdn.shopify.com/s/files/1/0434/1019/4582/files/blacksad_juego_de_rol_descargar.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/81274949660.pdf
    • https://cdn.shopify.com/s/files/1/0429/3758/1734/files/zukaguzovesogokuxi.pdf
    • https://cdn.shopify.com/s/files/1/0432/0264/2075/files/73348798597.pdf
    • https://cdn.shopify.com/s/files/1/0437/7663/9134/files/81646474732.pdf
    • https://cdn.shopify.com/s/files/1/0438/3929/1554/files/theraband_exercises_for_shoulder_impingement.pdf
    • https://cdn.shopify.com/s/files/1/0427/9477/8791/files/10442048885.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007cd5.bin
7ee340b1d7872ba91e4323d9c859be9ecbed8460a7ab2ff8b4ede84d6c0bc347
pdf-font-stream PDF embedded font (sfnt) at offset 0x7CD5 5360 bytes
font_01_sfnt_off00008efa.bin
25c0e4c66ba7627e8ec8044b22f46c3a53e088706308df656c65d52ca01b4cf9
pdf-font-stream PDF embedded font (sfnt) at offset 0x8EFA 9980 bytes
font_02_sfnt_off0000b11b.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e
pdf-font-stream PDF embedded font (sfnt) at offset 0xB11B 4324 bytes