Malicious PDF — malware analysis report

Static analysis result for SHA-256 98a62fce3801cdca…

MALICIOUS

PDF

49.4 KB Created: 2020-08-23 17:38:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f8b7cd390be1bdebb1fb036674c1effc SHA-1: de2b461f5702b503a7c088cd80d60c782a2574d4 SHA-256: 98a62fce3801cdcabb183a6f633fcc3b7fc842c2a0af80c13a12c68aac4891a9
152 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which points to a known malicious redirector at 'ttraff.com'. The document body, though heavily obfuscated, contains text suggesting a lure for cracked software, specifically mentioning 'Avast full cracked apk'. This indicates a phishing attempt to redirect users to malicious content. The presence of numerous links, many hosted on Shopify, suggests a link farm technique to improve search engine visibility for the malicious 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.com/pify?keyword=avast+full+cracked+apk
    • http://files.rosskay.com/uploads/1/3/1/4/131408581/pabamuwov-jukizax-texuxixigilim.pdf
    • http://gowape.casaalba.org/uploads/1/3/2/6/132695278/sesiz-rumedupotowawep.pdf
    • https://cdn.shopify.com/s/files/1/0437/8768/1954/files/missed_abortion.pdf
    • https://cdn.shopify.com/s/files/1/0430/0485/4435/files/sejuzedezotilila.pdf
    • https://cdn.shopify.com/s/files/1/0436/1938/5504/files/27016772546.pdf
    • https://cdn.shopify.com/s/files/1/0429/0379/7913/files/word_cookies_answers_creme_brulee_05.pdf
    • https://cdn.shopify.com/s/files/1/0431/8131/0114/files/anatomy_for_3d_artists.pdf
    • https://cdn.shopify.com/s/files/1/0433/7877/0076/files/diaper_raffle_tickets_template_printable.pdf
    • https://cdn.shopify.com/s/files/1/0434/1674/8188/files/african_nationalist_historiography.pdf
    • https://cdn.shopify.com/s/files/1/0435/5633/9861/files/lataneza.pdf
    • https://cdn.shopify.com/s/files/1/0434/4489/5909/files/star_spangled_banner_sheet_music_with_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0441/2683/0744/files/cessna_172_pilot_operating_handbook.pdf
    • https://cdn.shopify.com/s/files/1/0436/8151/3622/files/tosonesedebaxola.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_off00006ee7.bin
d99df52c8f52cf04810031a21724611996f489191cf33ee94368589f3a92cafd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6EE7 5264 bytes
font_01_sfnt_off000080de.bin
b4318daeb0b75d7d350701d704295b3474b6cf9d34190d9d76300365147d4765		 pdf-font-stream PDF embedded font (sfnt) at offset 0x80DE 10120 bytes
font_02_sfnt_off0000a3b4.bin
f6e0f4a25f18a144688c6b7f40519a5efc98c72643b9054f89526e396d9b459d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA3B4 16144 bytes

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