Malicious PDF — malware analysis report

Static analysis result for SHA-256 71806aaf46dd62f3…

MALICIOUS

PDF

46.1 KB Created: 2020-08-14 10:49:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ac0a62f420a88622874be65bf34ca7ce SHA-1: 2b343d9c7bc6c5bccaa36773382cba6fa1e9452c SHA-256: 71806aaf46dd62f31663e2f7fa4536c6fcb8384be522c69684a22f916417dcd9
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains multiple embedded links, with one prominently displayed as 'https://ttraff.com/pify?keyword=basic+physics+mcqs+with+answers'. This link is flagged as a malicious redirector. The PDF also features a link farm heuristic, indicating an attempt to generate traffic or distribute content through numerous external links, many of which point to potentially malicious domains. The ML classifier strongly suggests 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=basic+physics+mcqs+with+answers
    • http://rizuru.pestcontrolsolutionsla.com/uploads/1/3/1/4/131412181/febumebamisirazoparo.pdf
    • http://tojaxil.cuttingedgedm.com/uploads/1/3/2/8/132814928/timivajomer-kokipibiso.pdf
    • http://fesegamok.rowdygainesmastersclassic.com/uploads/1/3/1/3/131383790/8888838.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0445/1749/0847/files/wikatoravepo.pdf
    • https://cdn.shopify.com/s/files/1/0429/9322/1783/files/8152297183.pdf
    • https://cdn.shopify.com/s/files/1/0433/7192/1571/files/73804272715.pdf
    • https://cdn.shopify.com/s/files/1/0429/9682/6273/files/salufisiw.pdf
    • https://cdn.shopify.com/s/files/1/0435/9713/6030/files/takekogakaz.pdf
    • https://cdn.shopify.com/s/files/1/0430/9463/8749/files/stripe_test_credit_card.pdf
    • https://cdn.shopify.com/s/files/1/0428/7699/3695/files/legidaweliv.pdf
    • https://cdn.shopify.com/s/files/1/0431/7793/5005/files/lakogeragisivufegapug.pdf
    • https://cdn.shopify.com/s/files/1/0448/1184/5793/files/21607054706.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_off00006877.bin
1c03e997d028dca20c558676e73b7c277cc2f0630330dfab93bb89a141f09bd2
pdf-font-stream PDF embedded font (sfnt) at offset 0x6877 5188 bytes
font_01_sfnt_off00007a00.bin
9705d5e6536d5ac9be5682fba0f1cba91f9a6729e873f1c296e98f521849abc0
pdf-font-stream PDF embedded font (sfnt) at offset 0x7A00 10528 bytes
font_02_sfnt_off00009dc3.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e
pdf-font-stream PDF embedded font (sfnt) at offset 0x9DC3 4324 bytes