Malicious PDF — malware analysis report

Static analysis result for SHA-256 758c292a31f11a24…

MALICIOUS

PDF

34.0 KB Created: 2020-08-10 18:57:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ae2a7363456fd08147098ecbb33d0fe6 SHA-1: e4b2c9c18ac33aacae43c11d12df978e3c98602c SHA-256: 758c292a31f11a240d3ae70db7819834541ec33a2a52d7bee4a4df777edfc05e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm and a critical redirector link pointing to malicious infrastructure. The document body, though partially obfuscated, includes the URL 'https://ttraff.cc/pify?keyword=series+of+adjectives+worksheets+for+grade+3+pdf', suggesting a lure to download further malicious content. 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.cc/pify?keyword=series+of+adjectives+worksheets+for+grade+3+pdf
    • http://files.pcommops.com/uploads/1/3/2/7/132710763/juzaxaxawir.pdf
    • http://files.elmezcalmenu.com/uploads/1/3/1/1/131164081/pukakotagu_judegiwanono_xozero_lizowes.pdf
    • http://files.jesuitapush.com/uploads/1/3/0/8/130813317/walome-sefukabekewusef-vebaralanoguxel.pdf
    • http://files.blendmaster.org/uploads/1/3/1/4/131438025/4602987.pdf
    • http://sifijaku.nuggets.space/uploads/1/3/1/6/131606255/gemaxaw.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/3170/8316/files/suwatukazomuke.pdf
    • https://cdn.shopify.com/s/files/1/0433/6893/9672/files/66598752576.pdf
    • https://cdn.shopify.com/s/files/1/0438/6376/9243/files/tosopokikakujurolugan.pdf
    • https://cdn.shopify.com/s/files/1/0440/0575/2997/files/boeing_747_maintenance_manual.pdf
    • https://cdn.shopify.com/s/files/1/0432/1830/5179/files/urban_dictionary_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0441/2804/3160/files/casino_card_game_rules.pdf
    • https://cdn.shopify.com/s/files/1/0438/0511/4528/files/68054035619.pdf
    • https://cdn.shopify.com/s/files/1/0431/0866/3456/files/bafogazifesaxul.pdf
    • https://cdn.shopify.com/s/files/1/0432/3426/3199/files/bopix.pdf
    • https://cdn.shopify.com/s/files/1/0437/7103/5809/files/bimitufefe.pdf
    • https://cdn.shopify.com/s/files/1/0439/3277/8651/files/introductory_econometrics_for_finance.pdf
    • https://cdn.shopify.com/s/files/1/0429/7241/4106/files/moving_averages_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0430/2536/7194/files/5312116725.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004725.bin
08383b0ec84317d421c98fa5857686f9975b88f2be99e847663162ba0a853fef		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4725 5944 bytes
font_01_sfnt_off00005b72.bin
4e87402a355e0f9e925f1b9071466e37ea60efe9d313cb8169cb8dd5751e1b39		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B72 9160 bytes

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