Malicious PDF — malware analysis report

Static analysis result for SHA-256 874add9e31eb1d39…

MALICIOUS

PDF

44.7 KB Created: 2020-08-14 21:39:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4158bb13964898fd048b479a4ee2c2f0 SHA-1: 5d598804c4209a8e822d4cbad0db01d18e54eeb3 SHA-256: 874add9e31eb1d39c5c395327457889b59739330bbd884005c5ff807772467a8
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, with a critical heuristic identifying it as a link farm pointing to a malicious redirector at 'ttraff.com'. The document body, though partially corrupted, contains text related to 'ipad combine photos into pdf', suggesting a lure to disguise the malicious intent. The presence of many Shopify links, some confirmed benign and others unknown, indicates an attempt to blend malicious links with legitimate ones. No scripts were extracted, but the primary attack vector appears to be directing users to malicious infrastructure via embedded links.

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/wb?keyword=ipad%20combine%20photos%20into%20pdf
    • http://fedapove.jnfr-w.com/uploads/1/3/0/7/130776716/wojawidelono.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/6497/5765/files/15673767495.pdf
    • https://cdn.shopify.com/s/files/1/0433/2231/0811/files/31800982607.pdf
    • https://cdn.shopify.com/s/files/1/0431/9058/3458/files/blackout_poetry_maker.pdf
    • https://cdn.shopify.com/s/files/1/0447/5237/1863/files/enlace_glucosdico.pdf
    • https://cdn.shopify.com/s/files/1/0430/5593/9733/files/82712901580.pdf
    • https://cdn.shopify.com/s/files/1/0437/4190/5050/files/difc_arbitration_law.pdf
    • https://cdn.shopify.com/s/files/1/0430/3152/7577/files/bezodiwisis.pdf
    • https://cdn.shopify.com/s/files/1/0430/3942/4663/files/singleton_design_pattern_in_c.pdf
    • https://cdn.shopify.com/s/files/1/0435/3359/8880/files/78084174329.pdf
    • https://cdn.shopify.com/s/files/1/0428/6211/7031/files/41707536095.pdf
    • https://cdn.shopify.com/s/files/1/0431/7482/2044/files/rumapotiwesi.pdf
    • https://cdn.shopify.com/s/files/1/0427/9985/7823/files/cara_membuat_bookmark_dengan_adobe_acrobat_reader_dc.pdf
    • https://cdn.shopify.com/s/files/1/0430/6262/4405/files/64379538413.pdf
    • https://cdn.shopify.com/s/files/1/0431/8937/1040/files/the_unfinished_nation_6th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0434/4469/9288/files/96894262671.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_off0000646e.bin
bae193b2abbe091107cf901bd0dd34875650db58a84b6dc05552ddd847c5fda3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x646E 5344 bytes
font_01_sfnt_off00007660.bin
7c4e7c28dae9a4f3056cf21d6284d9148ef17ef30849019f61463be8475b85fa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7660 4120 bytes
font_02_sfnt_off000081c6.bin
c95c482c04dd1ba236faced7196ca7ee4e197db9ac64d72bdf82a39ef5b225ec		 pdf-font-stream PDF embedded font (sfnt) at offset 0x81C6 10560 bytes

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