Malicious PDF — malware analysis report

Static analysis result for SHA-256 1942647bd853d1ce…

MALICIOUS

PDF

45.0 KB Created: 2020-08-03 16:46:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5eecc8663517d086785ae3959d6515ae SHA-1: ff76e93aefbaa93767f839484c4c4edc3fc10ded SHA-256: 1942647bd853d1ce20749d34c22b6035fed2337a9ceb7d0b2a185dc6fb1a08fc
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with one identified as a malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, suggesting an attempt to drive traffic to various sites. The ML classifier also strongly flagged this PDF as malicious. The primary IOC is the malicious redirector URL, which likely leads to further malicious content or phishing pages.

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=mixed+present+tenses+exercises+pdf
    • http://files.topofthepodium.org/uploads/1/3/2/8/132815748/soput-fuvakujituguno-figumuzirijujo-puxuwubazub.pdf
    • http://files.pachamama-yoga.com/uploads/1/3/1/4/131406437/6295115.pdf
    • http://files.thunderrunners.co.uk/uploads/1/3/1/3/131381518/tijajopedizevepud.pdf
    • http://files.dharmendhaliah.com/uploads/1/3/0/8/130873894/225270.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0432/5618/5000/files/napemilesolux.pdf
    • https://cdn.shopify.com/s/files/1/0430/5122/1146/files/8388845807.pdf
    • https://cdn.shopify.com/s/files/1/0436/3560/5664/files/6846032682.pdf
    • https://cdn.shopify.com/s/files/1/0440/7289/4629/files/10919612852.pdf
    • https://cdn.shopify.com/s/files/1/0431/0705/7825/files/country_girl_shake_it_for_me_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0429/5216/3482/files/lezazazowujanu.pdf
    • https://cdn.shopify.com/s/files/1/0428/3708/2271/files/62318153297.pdf
    • https://cdn.shopify.com/s/files/1/0431/6174/7620/files/sinonijujasewijokixiveju.pdf
    • https://cdn.shopify.com/s/files/1/0428/4570/0262/files/baseball_card_price_guide.pdf
    • https://cdn.shopify.com/s/files/1/0438/4718/8640/files/33440453165.pdf
    • https://cdn.shopify.com/s/files/1/0433/7562/4355/files/81651802714.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_off000065e3.bin
f0902311297dba085c7b7bcd7b6554e3883b4a93e688e3cfbe42f565a9d427a2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65E3 4660 bytes
font_01_sfnt_off000075ce.bin
7aa039a72f74020b8516d9577fb52c1498ec61621f5c4bc90dbd6bdb39e6882b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75CE 10272 bytes
font_02_sfnt_off000098fc.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x98FC 4324 bytes

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