Malicious PDF — malware analysis report

Static analysis result for SHA-256 22a8724e9e073744…

MALICIOUS

PDF

102.0 KB Created: 2020-08-13 22:04:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d9b0938f220e75438c176ce5dc91055b SHA-1: 18d3305bce604fae4d6c841d82615fb9728d10e6 SHA-256: 22a8724e9e073744da0c78fe80354512dee92308eaeb4b50f916279af8863c1e
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.ru'. The document body, though heavily obfuscated, appears to contain text related to 'Federal itemized deductions worksheet 2017' and the malicious URL itself. This suggests a phishing attempt to lure users to a malicious site under the guise of a tax document.

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=federal+itemized+deductions+worksheet+2017
    • http://files.deborahbdesign.com/uploads/1/3/2/7/132712306/gawir.pdf
    • http://files.chardoncommunityactionteam.org/uploads/1/3/1/3/131384018/pugotut-newifuniz.pdf
    • http://files.westminstermedicalclinic.com/uploads/1/3/0/8/130874474/1112489.pdf
    • http://vepitifef.healingbottoms.com/uploads/1/3/1/8/131856158/bd9f098f6.pdf
    • https://cdn.shopify.com/s/files/1/0432/7460/0598/files/19248111821.pdf
    • https://cdn.shopify.com/s/files/1/0432/3858/8584/files/copy_t_file_b_li_font.pdf
    • https://cdn.shopify.com/s/files/1/0433/4593/6534/files/31349146302.pdf
    • https://cdn.shopify.com/s/files/1/0433/9138/5758/files/two_player_card_games.pdf
    • https://cdn.shopify.com/s/files/1/0434/6275/4461/files/sc_st_atrocities_act.pdf
    • https://cdn.shopify.com/s/files/1/0429/2545/7575/files/dolom.pdf
    • https://cdn.shopify.com/s/files/1/0436/7004/4825/files/instagram_password_hack.pdf
    • https://cdn.shopify.com/s/files/1/0430/3667/2162/files/vapunukobalibabiruvinefa.pdf
    • https://cdn.shopify.com/s/files/1/0435/4798/4027/files/opposite_words_for_class_3.pdf
    • https://cdn.shopify.com/s/files/1/0430/5498/9466/files/codingbat_answers_warmup_1.pdf
    • https://cdn.shopify.com/s/files/1/0433/0664/7717/files/36743202595.pdf
    • https://cdn.shopify.com/s/files/1/0437/7028/2142/files/13725014933.pdf
    • https://cdn.shopify.com/s/files/1/0430/1615/9381/files/judixowibezin.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001384a.bin
e11ac7bc6599ec3412345b255da8060ae95196538044ce7eb44d5bffed13ac82		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1384A 5744 bytes
font_01_sfnt_off00014bca.bin
41a6c0c6b2c8bfa2ee28b545226dc54d009193eafa31cd0ba678b8d7effbad03		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14BCA 12180 bytes
font_02_sfnt_off000174e0.bin
99ddc6f5858eb134f8024171ebe717cbd02485c31471b921a5021903b5272953		 pdf-font-stream PDF embedded font (sfnt) at offset 0x174E0 16060 bytes

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