Malicious PDF — malware analysis report

Static analysis result for SHA-256 8851563f6a3f396a…

MALICIOUS

PDF

33.8 KB Created: 2020-08-12 18:16:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1bfbab80b8819f7cfdf67f781dbea26b SHA-1: 1ab35439174e7e830c2988c2a06a6812e4eb1124 SHA-256: 8851563f6a3f396a8a9b6e46c49823d736a402793f84d6f3cc3091f4e9b6fa0d
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector at 'https://ttraff.com/pify?keyword=springboard+algebra+2+pdf'. This suggests the document is part of a link farm or SEO poisoning campaign designed to lure users to malicious sites. No scripts were extracted, and the document body is heavily obfuscated, but the presence of the malicious redirector is a strong indicator of malicious intent.

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=springboard+algebra+2+pdf
    • http://files.bullfrogandichingbeads.com/uploads/1/3/1/3/131381374/12d315796f8.pdf
    • http://files.thesalvagesisters.net/uploads/1/3/0/8/130813846/5401d.pdf
    • http://fejujivek.brandtmarineinc.com/uploads/1/3/0/7/130739615/4248737.pdf
    • http://files.madisonbizreview.com/uploads/1/3/1/6/131637701/dikagi.pdf
    • https://cdn.shopify.com/s/files/1/0437/5832/1818/files/lodash_compare_objects.pdf
    • https://cdn.shopify.com/s/files/1/0433/2437/5194/files/89464183515.pdf
    • https://cdn.shopify.com/s/files/1/0430/7209/4362/files/cu_boulder_campus_map.pdf
    • https://cdn.shopify.com/s/files/1/0434/1547/0245/files/the_economist_2020_june.pdf
    • https://cdn.shopify.com/s/files/1/0434/9470/3270/files/dictation_exercises_for_english_learners.pdf
    • https://cdn.shopify.com/s/files/1/0433/3430/3912/files/vesafelulanisus.pdf
    • https://cdn.shopify.com/s/files/1/0434/6642/4486/files/70352574848.pdf
    • https://cdn.shopify.com/s/files/1/0431/6980/8548/files/49448509897.pdf
    • https://cdn.shopify.com/s/files/1/0438/9814/2875/files/a_room_of_one_s_own_themes.pdf
    • https://cdn.shopify.com/s/files/1/0429/9862/8501/files/66335078475.pdf
    • https://cdn.shopify.com/s/files/1/0433/7175/7718/files/9258940519.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/zijuk.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_off00004563.bin
d03f47da16b6b1f8602208aed5923631a6aaaf49f33ffc1f823517adb5ee249e
pdf-font-stream PDF embedded font (sfnt) at offset 0x4563 5404 bytes
font_01_sfnt_off000057c9.bin
11ed85b353cfb14e7f6200c39227103055c909d6fce52c67a32aa581a5fc1c29
pdf-font-stream PDF embedded font (sfnt) at offset 0x57C9 10196 bytes