Malicious PDF — malware analysis report

Static analysis result for SHA-256 85dc6e0102f6de68…

MALICIOUS

PDF

47.5 KB Created: 2020-09-01 05:05:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fcba066a52af430ae5ee18c05176244f SHA-1: fd51fd390defb1c664c6631b333e50dab0f975b4 SHA-256: 85dc6e0102f6de6830e27a3b0a6f08d8bbf3e1dbe4b897ac090dbfb411ff3d5d
152 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier as malicious and contains a critical heuristic indicating it links to known malicious redirector infrastructure. It also exhibits characteristics of a PDF link farm, embedding numerous external links, with the primary malicious URL being ttraff.ru. The document body, though heavily obfuscated, contains the same malicious URL and references to benign-looking Shopify links, suggesting a deceptive lure.

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=case+in+affitto+a+bressa+di+campoformido
    • https://cdn.shopify.com/s/files/1/0437/6995/4456/files/reading_strategies_book_by_jennifer_serravallo.pdf
    • https://cdn.shopify.com/s/files/1/0434/1540/4695/files/37080285475.pdf
    • https://cdn.shopify.com/s/files/1/0429/3342/0199/files/59813433853.pdf
    • https://cdn.shopify.com/s/files/1/0428/9875/1641/files/beehive_class_9_english_book.pdf
    • https://cdn.shopify.com/s/files/1/0433/8037/5704/files/37198287576.pdf
    • https://cdn.shopify.com/s/files/1/0432/1509/3917/files/adventurers_backpack_skyrim.pdf
    • https://cdn.shopify.com/s/files/1/0438/2500/4706/files/anexos_de_la_piel.pdf
    • https://cdn.shopify.com/s/files/1/0428/0877/0726/files/gebifidumufujizotarebov.pdf
    • https://cdn.shopify.com/s/files/1/0428/0241/3735/files/the_weeknd_starboy_album_download_mp3.pdf
    • https://cdn.shopify.com/s/files/1/0432/1542/1600/files/o_alienista_hq.pdf
    • https://cdn.shopify.com/s/files/1/0431/1737/9750/files/bekofavudovat.pdf
    • https://static.usrfiles.com/ugd/43d598_4dd7badbb38f42bb8d933e6bc0bc4c27.pdf
    • https://static.usrfiles.com/ugd/b8c837_76409856b9294693a9f06cf6e0a0edd5.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_off00006c5e.bin
d0927c5f3c6030b1ab7085d262af968c491a57cf7bfabd3f3140b0475f509581
pdf-font-stream PDF embedded font (sfnt) at offset 0x6C5E 5220 bytes
font_01_sfnt_off00007df9.bin
e975cce45b95028cd64ff9285eb39b8fd904b8d992968e5b0f5146cee64363bd
pdf-font-stream PDF embedded font (sfnt) at offset 0x7DF9 10844 bytes
font_02_sfnt_off0000a16f.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71
pdf-font-stream PDF embedded font (sfnt) at offset 0xA16F 4324 bytes