Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd4c6f05e9bf57b2…

MALICIOUS

PDF

43.3 KB Created: 2020-08-08 13:07:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 11deb0e0a5878503b4e2e5acf405636f SHA-1: 1fda93564d2d405160ebc5e889d7a3912e2f2dc8 SHA-256: fd4c6f05e9bf57b2771eaa5de6241d483e9e0f1d9103121c786c5393e09c32fc
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, includes the URL 'https://ttraff.cc/pify?keyword=digging+the+africanist+presence+in+american+performance+pdf', suggesting a lure to a malicious site. The presence of a large number of external PDF links, many hosted on Shopify, indicates a link farm strategy. The ML classifier also strongly flagged this PDF as malicious.

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=digging+the+africanist+presence+in+american+performance+pdf
    • http://files.lllofmenh.org/uploads/1/3/2/6/132681824/cba3f5f9dddf4.pdf
    • http://files.talentztickets.com/uploads/1/3/2/6/132681928/xejivid.pdf
    • http://files.willowtreecathotel.co.uk/uploads/1/3/1/3/131381518/vemevipuwozuwuv.pdf
    • https://cdn.shopify.com/s/files/1/0431/2986/4343/files/voromurajagedopeludezukux.pdf
    • https://cdn.shopify.com/s/files/1/0430/7091/4717/files/67419499066.pdf
    • https://cdn.shopify.com/s/files/1/0433/5167/0943/files/dilemipovifibevuvilotize.pdf
    • https://cdn.shopify.com/s/files/1/0428/2312/3100/files/metafisica_de_aristoteles_giovanni_reale.pdf
    • https://cdn.shopify.com/s/files/1/0433/9010/7815/files/new_headway_beginner_4th_edition_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/6126/5062/files/62078_iphone-_sync.pdf
    • https://cdn.shopify.com/s/files/1/0440/7482/7941/files/durij.pdf
    • https://cdn.shopify.com/s/files/1/0437/0356/6486/files/7823244473.pdf
    • https://cdn.shopify.com/s/files/1/0439/0528/6296/files/architektura_i_biznes.pdf
    • https://cdn.shopify.com/s/files/1/0428/5408/8871/files/77173419390.pdf
    • https://cdn.shopify.com/s/files/1/0433/3459/8809/files/ctet_answer_key_december_2020_download.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_off00006943.bin
41b58c079b4378472622469b7ae8da390e33d00dc95183029eecee03bdda8f9b
pdf-font-stream PDF embedded font (sfnt) at offset 0x6943 5536 bytes
font_01_sfnt_off00007bfd.bin
d5538fc80425e16b14226fb8b69b0675f3ac176797f722823f4453ad1caa5528
pdf-font-stream PDF embedded font (sfnt) at offset 0x7BFD 10628 bytes