Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbf14dc5c440aa76…

MALICIOUS

PDF

47.7 KB Created: 2020-08-20 00:39:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 268c7bba66eb0960ee8860b94735bc26 SHA-1: b7d9f0ce7950012dc68b16a8be72fd621a1c5daf SHA-256: cbf14dc5c440aa7615a0ca4ee1268b9f54804d4b25decc051038d612bff4551f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded links, many of which point to Shopify domains hosting PDF files, suggesting an attempt at SEO poisoning to drive traffic. One critical heuristic identified a link to a known malicious redirector at 'https://ttraff.ru/pify?keyword=chemistry+1+periodic+table+worksheet+answers'. The document body, though partially corrupted, contains keywords related to 'chemistry' and 'worksheet answers', reinforcing the lure. No scripts were extracted, but the primary attack vector appears to be redirecting users to malicious infrastructure.

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=chemistry+1+periodic+table+worksheet+answers
    • http://files.deeyergo.com/uploads/1/3/0/8/130814716/bapob-vumaliv-navawokorenu.pdf
    • http://files.bonedancejewelry.com/uploads/1/3/1/1/131164574/c2870f9e3a7b753.pdf
    • https://cdn.shopify.com/s/files/1/0439/9982/1982/files/probability_theory_and_stochastic_processes_by_y_mallikarjuna_reddy.pdf
    • https://cdn.shopify.com/s/files/1/0437/5032/6421/files/student_id_card_template_vector.pdf
    • https://cdn.shopify.com/s/files/1/0433/0445/2246/files/75552536551.pdf
    • https://cdn.shopify.com/s/files/1/0435/6331/9445/files/snurfle_meiosis_and_genetics_worksheet_answers.pdf
    • https://cdn.shopify.com/s/files/1/0434/5361/2182/files/78259829921.pdf
    • https://cdn.shopify.com/s/files/1/0433/6815/3253/files/damivifezuvajezabab.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/87913440599.pdf
    • https://cdn.shopify.com/s/files/1/0431/0515/7282/files/kuzap.pdf
    • https://cdn.shopify.com/s/files/1/0432/0644/3176/files/38154572345.pdf
    • https://cdn.shopify.com/s/files/1/0428/2492/5347/files/ladabevumibi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/28821374719.pdf
    • https://cdn.shopify.com/s/files/1/0431/4411/8434/files/amazon_financial_report.pdf
    • https://cdn.shopify.com/s/files/1/0437/1765/6731/files/ccna_routing_and_switching_portable_command_guide.pdf
    • https://cdn.shopify.com/s/files/1/0437/1664/0919/files/ledexugobomogugofutimajus.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_off00006fba.bin
a17885b4fd577e0298a64705d5055d2ac7c2363fd7008e9cf236b3df412a17d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FBA 2828 bytes
font_01_sfnt_off000079b4.bin
304d34512af7747baf7ce45a1e0e2f33498fa64f04ea8651cfd8b51e78c744d6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79B4 5668 bytes
font_02_sfnt_off00008ce7.bin
691e4d2c0af7b6dbc838516d31c83996af2a8120eefd8548d51a8f67031e3e4e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8CE7 9860 bytes

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