Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9ffbb57c9f7966f…

MALICIOUS

PDF

44.2 KB Created: 2020-08-17 17:39:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dc08b71fb4080ff4fa08e6c2fa74c475 SHA-1: 03db026150978a85e3ca715daccc60bec9f5fcc0 SHA-256: f9ffbb57c9f7966fb9682261279b6e88a7f586ec6c54803a8f7dd90905dbeeb9
152 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded URLs, with one critical heuristic identifying it as a malicious redirector link pointing to 'https://ttraff.ru/pify?keyword=alphabet+stencil+template+free'. Another critical heuristic flags it as a PDF link farm, with 28 external PDF links, many hosted on cdn.shopify.com. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the extensive link farm and redirector suggest an attempt to lure users to malicious sites or manipulate search engine results.

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.ru/pify?keyword=alphabet+stencil+template+free
    • http://files.pltesig.org/uploads/1/3/2/6/132680901/sejositovunedaj.pdf
    • http://jaxironob.visionarylead.org/uploads/1/3/1/1/131163599/bonusagebekafoxi.pdf
    • https://cdn.shopify.com/s/files/1/0431/2737/3986/files/69316220119.pdf
    • https://cdn.shopify.com/s/files/1/0432/2312/2084/files/33835403077.pdf
    • https://cdn.shopify.com/s/files/1/0427/7652/7014/files/97180027868.pdf
    • https://cdn.shopify.com/s/files/1/0434/6265/6152/files/20010964937.pdf
    • https://cdn.shopify.com/s/files/1/0430/6377/1293/files/47669629254.pdf
    • https://cdn.shopify.com/s/files/1/0428/1267/0111/files/bridge_to_terabithia_whole_book_quiz.pdf
    • https://cdn.shopify.com/s/files/1/0432/3095/3630/files/miley_jab_hum_tum.pdf
    • https://cdn.shopify.com/s/files/1/0436/8669/0969/files/wacom_intuos_pro_pth-_651_driver.pdf
    • https://cdn.shopify.com/s/files/1/0436/2544/7587/files/wwe_boxing_games_free_java.pdf
    • https://cdn.shopify.com/s/files/1/0439/1007/0440/files/english_punctuation_exercises_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0433/9315/5237/files/37470034389.pdf
    • https://cdn.shopify.com/s/files/1/0428/3210/1543/files/59687737494.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006eab.bin
70474703c6f685ad31e79e09044645218da7f54110a9667cf26ccee6ac8fa6ca
pdf-font-stream PDF embedded font (sfnt) at offset 0x6EAB 5384 bytes
font_01_sfnt_off000080c3.bin
4cfda77a829fcf60bb6e8642130ae22f80646945dc8eb35ae45fce099205664d
pdf-font-stream PDF embedded font (sfnt) at offset 0x80C3 10328 bytes