Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a87224a2384ba61…

MALICIOUS

PDF

57.4 KB Created: 2020-08-21 03:03:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 46f99dd1b0c79af320a30cf568fe70ba SHA-1: 47ab9e821e651aabb56062852237fe384d9d3739 SHA-256: 5a87224a2384ba619e5effe219a2ff7a45b40e2b616794c4f041f505588a17e1
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link to a known malicious redirector, ttraff.com, which is likely intended to lead the user to a malicious site. The document body, though heavily obfuscated, contains the same redirector URL and a URL pointing to a PDF hosted on Shopify, which is likely part of a link farm. The ML classifier also strongly indicated maliciousness.

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.com/pify?keyword=g+m+c+ka+full+form
    • http://files.markbottenhorn.com/uploads/1/3/0/9/130969254/giroxukuju.pdf
    • http://files.ritastreasures.net/uploads/1/3/1/0/131070379/39d39c190a5ff.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://cdn.shopify.com/s/files/1/0428/7699/3702/files/jafegifa.pdf
    • https://cdn.shopify.com/s/files/1/0428/9894/8255/files/purufapabiwirobi.pdf
    • https://cdn.shopify.com/s/files/1/0431/2668/5858/files/sibuwepakalevujesom.pdf
    • https://cdn.shopify.com/s/files/1/0435/7432/9499/files/flush_by_carl_hiaasen.pdf
    • https://cdn.shopify.com/s/files/1/0433/2149/1621/files/negulid.pdf
    • https://cdn.shopify.com/s/files/1/0429/0471/5427/files/wopotavodadofela.pdf
    • https://cdn.shopify.com/s/files/1/0432/4186/5384/files/action_replay_max.pdf
    • https://cdn.shopify.com/s/files/1/0434/7097/9237/files/rimenarokuweru.pdf
    • https://cdn.shopify.com/s/files/1/0428/4357/0343/files/zogutobapisivuvonaji.pdf
    • https://cdn.shopify.com/s/files/1/0447/4735/8362/files/the_hateful_eight_script.pdf
    • https://cdn.shopify.com/s/files/1/0429/2512/9894/files/xixupumetoxaxa.pdf
    • https://cdn.shopify.com/s/files/1/0438/0547/4978/files/katuni_video_mp4.pdf
    • https://cdn.shopify.com/s/files/1/0427/5296/6812/files/rise_and_fall_civilizations_at_war.pdf
    • https://cdn.shopify.com/s/files/1/0432/5962/5627/files/whatsapp_status_video_save_app.pdf
    • https://cdn.shopify.com/s/files/1/0431/2642/3708/files/livro_epidemiologia_basica_bonita.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
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNU
    • http://www.gnu.org/copyleft/gpl.htmRegular

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000077da.bin
f60fb97d95729ac4e0b607d93ed329105381d3b93688a1f7cf551a1ade8717a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77DA 4944 bytes
font_01_sfnt_off00008895.bin
d5ecec3e822993868ba70e247019bcdb656a9fee58d620eb93bc70658e929280		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8895 3720 bytes
font_02_sfnt_off000093f8.bin
7be29e3fe70ed568fbfeb9e37d6239ea970b23233b560734d77456591386af62		 pdf-font-stream PDF embedded font (sfnt) at offset 0x93F8 13800 bytes
font_03_sfnt_off0000bfbb.bin
cce0a8c41a1f063372300734a811fb37c173ea1c55e8b36de9ff1ec75183652c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBFBB 7352 bytes

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