Malicious PDF — malware analysis report

Static analysis result for SHA-256 78ee26d3dadb523f…

MALICIOUS

PDF

56.5 KB Created: 2020-08-14 11:58:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2a63c0eb4edc9e606e9666eeb31011b5 SHA-1: 3bdd3ad2ca58de0c907efa4eac46cfc6b7dd94bd SHA-256: 78ee26d3dadb523f8e609b1804bc060065307e6e371f418775fb847d1fde3d7c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link to a known malicious redirector, disguised as a legal document template. It also hosts a large number of external PDF links, many of which are likely part of a link farm. The primary malicious URL identified is https://ttraff.ru/pify?keyword=gross+misconduct+dismissal+letter+template, which is likely used to redirect users to further 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.ru/pify?keyword=gross+misconduct+dismissal+letter+template
    • http://files.kdhodges.com/uploads/1/3/2/7/132740321/5360778.pdf
    • http://files.elenatziollo.com/uploads/1/3/1/1/131163599/nobejurun-xagupabubep-nizofuxekabu-dutomokizeraxot.pdf
    • http://files.roleofsource.com/uploads/1/3/0/7/130775393/xepovurav_nugidiwatidefe_zijat.pdf
    • http://files.gsskids.org/uploads/1/3/0/7/130738596/jawakegesa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/6740/0601/files/87357133254.pdf
    • https://cdn.shopify.com/s/files/1/0432/3121/5774/files/geguv.pdf
    • https://cdn.shopify.com/s/files/1/0427/7311/9143/files/bunuvalewiju.pdf
    • https://cdn.shopify.com/s/files/1/0429/3161/7945/files/gsm_security_alarm_system.pdf
    • https://cdn.shopify.com/s/files/1/0440/4301/0198/files/pioneer_mosfet_50wx4_manual_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/0032/3478/files/jasizewegufusivepawodipuz.pdf
    • https://cdn.shopify.com/s/files/1/0435/4090/6135/files/kawasaki_service_manual.pdf
    • https://cdn.shopify.com/s/files/1/0430/5597/2501/files/neural_networks_and_deep_learning_book.pdf
    • https://cdn.shopify.com/s/files/1/0431/0610/7552/files/rumus_aritmatika_sosial_pdf.pdf
    • https://cdn.shopify.com/s/files/1/0431/7901/6360/files/burukamimidemapowokimug.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000095b8.bin
a17885b4fd577e0298a64705d5055d2ac7c2363fd7008e9cf236b3df412a17d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x95B8 2828 bytes
font_01_sfnt_off00009fb2.bin
a4298a1626d5c5bc67af7a2ed64cc03b13358578c823fc1194307636b46890d5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9FB2 5252 bytes
font_02_sfnt_off0000b16c.bin
f958c487df80ca5925a6be8f908bf2bb827e78d60e0d89f12d7373818b0363c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB16C 9620 bytes

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